/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
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 *
 *
 *
 */
package javax.swing;


import java.util.HashSet;
import java.util.Hashtable;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.Locale;
import java.util.Vector;
import java.util.EventListener;
import java.util.Set;
import java.util.Map;
import java.util.HashMap;

import java.awt.*;
import java.awt.event.*;
import java.awt.image.VolatileImage;
import java.awt.Graphics2D;
import java.awt.peer.LightweightPeer;
import java.awt.dnd.DropTarget;
import java.awt.font.FontRenderContext;
import java.beans.PropertyChangeListener;
import java.beans.VetoableChangeListener;
import java.beans.VetoableChangeSupport;
import java.beans.Transient;

import java.applet.Applet;

import java.io.Serializable;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import java.io.ObjectInputValidation;
import java.io.InvalidObjectException;
import java.util.concurrent.atomic.AtomicBoolean;

import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.plaf.*;

import static javax.swing.ClientPropertyKey.*;

import javax.accessibility.*;

import sun.awt.SunToolkit;
import sun.swing.SwingUtilities2;
import sun.swing.UIClientPropertyKey;

/**
 * The base class for all Swing components except top-level containers. To use a component that
 * inherits from <code>JComponent</code>, you must place the component in a containment hierarchy
 * whose root is a top-level Swing container. Top-level Swing containers -- such as
 * <code>JFrame</code>, <code>JDialog</code>, and <code>JApplet</code> -- are specialized components
 * that provide a place for other Swing components to paint themselves. For an explanation of
 * containment hierarchies, see <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/toplevel.html">Swing
 * Components and the Containment Hierarchy</a>, a section in <em>The Java Tutorial</em>.
 *
 * <p> The <code>JComponent</code> class provides: <ul> <li>The base class for both standard and
 * custom components that use the Swing architecture. <li>A "pluggable look and feel" (L&amp;F) that
 * can be specified by the programmer or (optionally) selected by the user at runtime. The look and
 * feel for each component is provided by a <em>UI delegate</em> -- an object that descends from
 * {@link javax.swing.plaf.ComponentUI}. See <a href="https://docs.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html">How
 * to Set the Look and Feel</a> in <em>The Java Tutorial</em> for more information.
 * <li>Comprehensive keystroke handling. See the document <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/keybinding.html">How
 * to Use Key Bindings</a>, an article in <em>The Java Tutorial</em>, for more information.
 * <li>Support for tool tips -- short descriptions that pop up when the cursor lingers over a
 * component. See <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/tooltip.html">How
 * to Use Tool Tips</a> in <em>The Java Tutorial</em> for more information. <li>Support for
 * accessibility. <code>JComponent</code> contains all of the methods in the <code>Accessible</code>
 * interface, but it doesn't actually implement the interface.  That is the responsibility of the
 * individual classes that extend <code>JComponent</code>. <li>Support for component-specific
 * properties. With the {@link #putClientProperty} and {@link #getClientProperty} methods, you can
 * associate name-object pairs with any object that descends from <code>JComponent</code>. <li>An
 * infrastructure for painting that includes double buffering and support for borders. For more
 * information see <a href="http://www.oracle.com/technetwork/java/painting-140037.html#swing">Painting</a>
 * and <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/border.htmll">How to Use
 * Borders</a>, both of which are sections in <em>The Java Tutorial</em>. </ul> For more information
 * on these subjects, see the <a href="package-summary.html#package_description">Swing package
 * description</a> and <em>The Java Tutorial</em> section <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/jcomponent.html">The
 * JComponent Class</a>. <p> <code>JComponent</code> and its subclasses document default values for
 * certain properties.  For example, <code>JTable</code> documents the default row height as 16.
 * Each <code>JComponent</code> subclass that has a <code>ComponentUI</code> will create the
 * <code>ComponentUI</code> as part of its constructor.  In order to provide a particular look and
 * feel each <code>ComponentUI</code> may set properties back on the <code>JComponent</code> that
 * created it.  For example, a custom look and feel may require <code>JTable</code>s to have a row
 * height of 24. The documented defaults are the value of a property BEFORE the
 * <code>ComponentUI</code> has been installed.  If you need a specific value for a particular
 * property you should explicitly set it. <p> In release 1.4, the focus subsystem was rearchitected.
 * For more information, see <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
 * How to Use the Focus Subsystem</a>, a section in <em>The Java Tutorial</em>. <p>
 * <strong>Warning:</strong> Swing is not thread safe. For more information see <a
 * href="package-summary.html#threading">Swing's Threading Policy</a>. <p> <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with future Swing releases. The current
 * serialization support is appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage of all JavaBeans&trade; has
 * been added to the <code>java.beans</code> package. Please see {@link java.beans.XMLEncoder}.
 *
 * @author Hans Muller
 * @author Arnaud Weber
 * @see KeyStroke
 * @see Action
 * @see #setBorder
 * @see #registerKeyboardAction
 * @see JOptionPane
 * @see #setDebugGraphicsOptions
 * @see #setToolTipText
 * @see #setAutoscrolls
 */
public abstract class JComponent extends Container implements Serializable,
    TransferHandler.HasGetTransferHandler {

  /**
   * @see #getUIClassID
   * @see #writeObject
   */
  private static final String uiClassID = "ComponentUI";

  /**
   * @see #readObject
   */
  private static final Hashtable<ObjectInputStream, ReadObjectCallback> readObjectCallbacks =
      new Hashtable<ObjectInputStream, ReadObjectCallback>(1);

  /**
   * Keys to use for forward focus traversal when the JComponent is
   * managing focus.
   */
  private static Set<KeyStroke> managingFocusForwardTraversalKeys;

  /**
   * Keys to use for backward focus traversal when the JComponent is
   * managing focus.
   */
  private static Set<KeyStroke> managingFocusBackwardTraversalKeys;

  // Following are the possible return values from getObscuredState.
  private static final int NOT_OBSCURED = 0;
  private static final int PARTIALLY_OBSCURED = 1;
  private static final int COMPLETELY_OBSCURED = 2;

  /**
   * Set to true when DebugGraphics has been loaded.
   */
  static boolean DEBUG_GRAPHICS_LOADED;

  /**
   * Key used to look up a value from the AppContext to determine the
   * JComponent the InputVerifier is running for. That is, if
   * AppContext.get(INPUT_VERIFIER_SOURCE_KEY) returns non-null, it
   * indicates the EDT is calling into the InputVerifier from the
   * returned component.
   */
  private static final Object INPUT_VERIFIER_SOURCE_KEY =
      new StringBuilder("InputVerifierSourceKey");

  /* The following fields support set methods for the corresponding
     * java.awt.Component properties.
     */
  private boolean isAlignmentXSet;
  private float alignmentX;
  private boolean isAlignmentYSet;
  private float alignmentY;

  /**
   * Backing store for JComponent properties and listeners
   */

  /**
   * The look and feel delegate for this component.
   */
  protected transient ComponentUI ui;
  /**
   * A list of event listeners for this component.
   */
  protected EventListenerList listenerList = new EventListenerList();

  private transient ArrayTable clientProperties;
  private VetoableChangeSupport vetoableChangeSupport;
  /**
   * Whether or not autoscroll has been enabled.
   */
  private boolean autoscrolls;
  private Border border;
  private int flags;

  /* Input verifier for this component */
  private InputVerifier inputVerifier = null;

  private boolean verifyInputWhenFocusTarget = true;

  /**
   * Set in <code>_paintImmediately</code>.
   * Will indicate the child that initiated the painting operation.
   * If <code>paintingChild</code> is opaque, no need to paint
   * any child components after <code>paintingChild</code>.
   * Test used in <code>paintChildren</code>.
   */
  transient Component paintingChild;

  /**
   * Constant used for <code>registerKeyboardAction</code> that
   * means that the command should be invoked when
   * the component has the focus.
   */
  public static final int WHEN_FOCUSED = 0;

  /**
   * Constant used for <code>registerKeyboardAction</code> that
   * means that the command should be invoked when the receiving
   * component is an ancestor of the focused component or is
   * itself the focused component.
   */
  public static final int WHEN_ANCESTOR_OF_FOCUSED_COMPONENT = 1;

  /**
   * Constant used for <code>registerKeyboardAction</code> that
   * means that the command should be invoked when
   * the receiving component is in the window that has the focus
   * or is itself the focused component.
   */
  public static final int WHEN_IN_FOCUSED_WINDOW = 2;

  /**
   * Constant used by some of the APIs to mean that no condition is defined.
   */
  public static final int UNDEFINED_CONDITION = -1;

  /**
   * The key used by <code>JComponent</code> to access keyboard bindings.
   */
  private static final String KEYBOARD_BINDINGS_KEY = "_KeyboardBindings";

  /**
   * An array of <code>KeyStroke</code>s used for
   * <code>WHEN_IN_FOCUSED_WINDOW</code> are stashed
   * in the client properties under this string.
   */
  private static final String WHEN_IN_FOCUSED_WINDOW_BINDINGS = "_WhenInFocusedWindow";

  /**
   * The comment to display when the cursor is over the component,
   * also known as a "value tip", "flyover help", or "flyover label".
   */
  public static final String TOOL_TIP_TEXT_KEY = "ToolTipText";

  private static final String NEXT_FOCUS = "nextFocus";

  /**
   * <code>JPopupMenu</code> assigned to this component
   * and all of its children
   */
  private JPopupMenu popupMenu;

  /**
   * Private flags
   **/
  private static final int IS_DOUBLE_BUFFERED = 0;
  private static final int ANCESTOR_USING_BUFFER = 1;
  private static final int IS_PAINTING_TILE = 2;
  private static final int IS_OPAQUE = 3;
  private static final int KEY_EVENTS_ENABLED = 4;
  private static final int FOCUS_INPUTMAP_CREATED = 5;
  private static final int ANCESTOR_INPUTMAP_CREATED = 6;
  private static final int WIF_INPUTMAP_CREATED = 7;
  private static final int ACTIONMAP_CREATED = 8;
  private static final int CREATED_DOUBLE_BUFFER = 9;
  // bit 10 is free
  private static final int IS_PRINTING = 11;
  private static final int IS_PRINTING_ALL = 12;
  private static final int IS_REPAINTING = 13;
  /**
   * Bits 14-21 are used to handle nested writeObject calls.
   **/
  private static final int WRITE_OBJ_COUNTER_FIRST = 14;
  private static final int RESERVED_1 = 15;
  private static final int RESERVED_2 = 16;
  private static final int RESERVED_3 = 17;
  private static final int RESERVED_4 = 18;
  private static final int RESERVED_5 = 19;
  private static final int RESERVED_6 = 20;
  private static final int WRITE_OBJ_COUNTER_LAST = 21;

  private static final int REQUEST_FOCUS_DISABLED = 22;
  private static final int INHERITS_POPUP_MENU = 23;
  private static final int OPAQUE_SET = 24;
  private static final int AUTOSCROLLS_SET = 25;
  private static final int FOCUS_TRAVERSAL_KEYS_FORWARD_SET = 26;
  private static final int FOCUS_TRAVERSAL_KEYS_BACKWARD_SET = 27;

  private transient AtomicBoolean revalidateRunnableScheduled = new AtomicBoolean(false);

  /**
   * Temporary rectangles.
   */
  private static java.util.List<Rectangle> tempRectangles = new java.util.ArrayList<Rectangle>(11);

  /**
   * Used for <code>WHEN_FOCUSED</code> bindings.
   */
  private InputMap focusInputMap;
  /**
   * Used for <code>WHEN_ANCESTOR_OF_FOCUSED_COMPONENT</code> bindings.
   */
  private InputMap ancestorInputMap;
  /**
   * Used for <code>WHEN_IN_FOCUSED_KEY</code> bindings.
   */
  private ComponentInputMap windowInputMap;

  /**
   * ActionMap.
   */
  private ActionMap actionMap;

  /**
   * Key used to store the default locale in an AppContext
   **/
  private static final String defaultLocale = "JComponent.defaultLocale";

  private static Component componentObtainingGraphicsFrom;
  private static Object componentObtainingGraphicsFromLock = new
      StringBuilder("componentObtainingGraphicsFrom");

  /**
   * AA text hints.
   */
  transient private Object aaTextInfo;

  static Graphics safelyGetGraphics(Component c) {
    return safelyGetGraphics(c, SwingUtilities.getRoot(c));
  }

  static Graphics safelyGetGraphics(Component c, Component root) {
    synchronized (componentObtainingGraphicsFromLock) {
      componentObtainingGraphicsFrom = root;
      Graphics g = c.getGraphics();
      componentObtainingGraphicsFrom = null;
      return g;
    }
  }

  static void getGraphicsInvoked(Component root) {
    if (!JComponent.isComponentObtainingGraphicsFrom(root)) {
      JRootPane rootPane = ((RootPaneContainer) root).getRootPane();
      if (rootPane != null) {
        rootPane.disableTrueDoubleBuffering();
      }
    }
  }


  /**
   * Returns true if {@code c} is the component the graphics is being
   * requested of. This is intended for use when getGraphics is invoked.
   */
  private static boolean isComponentObtainingGraphicsFrom(Component c) {
    synchronized (componentObtainingGraphicsFromLock) {
      return (componentObtainingGraphicsFrom == c);
    }
  }

  /**
   * Returns the Set of <code>KeyStroke</code>s to use if the component
   * is managing focus for forward focus traversal.
   */
  static Set<KeyStroke> getManagingFocusForwardTraversalKeys() {
    synchronized (JComponent.class) {
      if (managingFocusForwardTraversalKeys == null) {
        managingFocusForwardTraversalKeys = new HashSet<KeyStroke>(1);
        managingFocusForwardTraversalKeys.add(
            KeyStroke.getKeyStroke(KeyEvent.VK_TAB,
                InputEvent.CTRL_MASK));
      }
    }
    return managingFocusForwardTraversalKeys;
  }

  /**
   * Returns the Set of <code>KeyStroke</code>s to use if the component
   * is managing focus for backward focus traversal.
   */
  static Set<KeyStroke> getManagingFocusBackwardTraversalKeys() {
    synchronized (JComponent.class) {
      if (managingFocusBackwardTraversalKeys == null) {
        managingFocusBackwardTraversalKeys = new HashSet<KeyStroke>(1);
        managingFocusBackwardTraversalKeys.add(
            KeyStroke.getKeyStroke(KeyEvent.VK_TAB,
                InputEvent.SHIFT_MASK |
                    InputEvent.CTRL_MASK));
      }
    }
    return managingFocusBackwardTraversalKeys;
  }

  private static Rectangle fetchRectangle() {
    synchronized (tempRectangles) {
      Rectangle rect;
      int size = tempRectangles.size();
      if (size > 0) {
        rect = tempRectangles.remove(size - 1);
      } else {
        rect = new Rectangle(0, 0, 0, 0);
      }
      return rect;
    }
  }

  private static void recycleRectangle(Rectangle rect) {
    synchronized (tempRectangles) {
      tempRectangles.add(rect);
    }
  }

  /**
   * Sets whether or not <code>getComponentPopupMenu</code> should delegate
   * to the parent if this component does not have a <code>JPopupMenu</code>
   * assigned to it.
   * <p>
   * The default value for this is false, but some <code>JComponent</code>
   * subclasses that are implemented as a number of <code>JComponent</code>s
   * may set this to true.
   * <p>
   * This is a bound property.
   *
   * @param value whether or not the JPopupMenu is inherited
   * @beaninfo bound: true description: Whether or not the JPopupMenu is inherited
   * @see #setComponentPopupMenu
   * @since 1.5
   */
  public void setInheritsPopupMenu(boolean value) {
    boolean oldValue = getFlag(INHERITS_POPUP_MENU);
    setFlag(INHERITS_POPUP_MENU, value);
    firePropertyChange("inheritsPopupMenu", oldValue, value);
  }

  /**
   * Returns true if the JPopupMenu should be inherited from the parent.
   *
   * @see #setComponentPopupMenu
   * @since 1.5
   */
  public boolean getInheritsPopupMenu() {
    return getFlag(INHERITS_POPUP_MENU);
  }

  /**
   * Sets the <code>JPopupMenu</code> for this <code>JComponent</code>.
   * The UI is responsible for registering bindings and adding the necessary
   * listeners such that the <code>JPopupMenu</code> will be shown at
   * the appropriate time. When the <code>JPopupMenu</code> is shown
   * depends upon the look and feel: some may show it on a mouse event,
   * some may enable a key binding.
   * <p>
   * If <code>popup</code> is null, and <code>getInheritsPopupMenu</code>
   * returns true, then <code>getComponentPopupMenu</code> will be delegated
   * to the parent. This provides for a way to make all child components
   * inherit the popupmenu of the parent.
   * <p>
   * This is a bound property.
   *
   * @param popup - the popup that will be assigned to this component may be null
   * @beaninfo bound: true preferred: true description: Popup to show
   * @see #getComponentPopupMenu
   * @since 1.5
   */
  public void setComponentPopupMenu(JPopupMenu popup) {
    if (popup != null) {
      enableEvents(AWTEvent.MOUSE_EVENT_MASK);
    }
    JPopupMenu oldPopup = this.popupMenu;
    this.popupMenu = popup;
    firePropertyChange("componentPopupMenu", oldPopup, popup);
  }

  /**
   * Returns <code>JPopupMenu</code> that assigned for this component.
   * If this component does not have a <code>JPopupMenu</code> assigned
   * to it and <code>getInheritsPopupMenu</code> is true, this
   * will return <code>getParent().getComponentPopupMenu()</code> (assuming
   * the parent is valid.)
   *
   * @return <code>JPopupMenu</code> assigned for this component or <code>null</code> if no popup
   * assigned
   * @see #setComponentPopupMenu
   * @since 1.5
   */
  public JPopupMenu getComponentPopupMenu() {

    if (!getInheritsPopupMenu()) {
      return popupMenu;
    }

    if (popupMenu == null) {
      // Search parents for its popup
      Container parent = getParent();
      while (parent != null) {
        if (parent instanceof JComponent) {
          return ((JComponent) parent).getComponentPopupMenu();
        }
        if (parent instanceof Window ||
            parent instanceof Applet) {
          // Reached toplevel, break and return null
          break;
        }
        parent = parent.getParent();
      }
      return null;
    }

    return popupMenu;
  }

  /**
   * Default <code>JComponent</code> constructor.  This constructor does
   * very little initialization beyond calling the <code>Container</code>
   * constructor.  For example, the initial layout manager is
   * <code>null</code>. It does, however, set the component's locale
   * property to the value returned by
   * <code>JComponent.getDefaultLocale</code>.
   *
   * @see #getDefaultLocale
   */
  public JComponent() {
    super();
    // We enable key events on all JComponents so that accessibility
    // bindings will work everywhere. This is a partial fix to BugID
    // 4282211.
    enableEvents(AWTEvent.KEY_EVENT_MASK);
    if (isManagingFocus()) {
      LookAndFeel.installProperty(this,
          "focusTraversalKeysForward",
          getManagingFocusForwardTraversalKeys());
      LookAndFeel.installProperty(this,
          "focusTraversalKeysBackward",
          getManagingFocusBackwardTraversalKeys());
    }

    super.setLocale(JComponent.getDefaultLocale());
  }


  /**
   * Resets the UI property to a value from the current look and feel.
   * <code>JComponent</code> subclasses must override this method
   * like this:
   * <pre>
   *   public void updateUI() {
   *      setUI((SliderUI)UIManager.getUI(this);
   *   }
   *  </pre>
   *
   * @see #setUI
   * @see UIManager#getLookAndFeel
   * @see UIManager#getUI
   */
  public void updateUI() {
  }


  /**
   * Sets the look and feel delegate for this component.
   * <code>JComponent</code> subclasses generally override this method
   * to narrow the argument type. For example, in <code>JSlider</code>:
   * <pre>
   * public void setUI(SliderUI newUI) {
   *     super.setUI(newUI);
   * }
   *  </pre>
   * <p>
   * Additionally <code>JComponent</code> subclasses must provide a
   * <code>getUI</code> method that returns the correct type.  For example:
   * <pre>
   * public SliderUI getUI() {
   *     return (SliderUI)ui;
   * }
   * </pre>
   *
   * @param newUI the new UI delegate
   * @beaninfo bound: true hidden: true attribute: visualUpdate true description: The component's
   * look and feel delegate.
   * @see #updateUI
   * @see UIManager#getLookAndFeel
   * @see UIManager#getUI
   */
  protected void setUI(ComponentUI newUI) {
        /* We do not check that the UI instance is different
         * before allowing the switch in order to enable the
         * same UI instance *with different default settings*
         * to be installed.
         */

    uninstallUIAndProperties();

    // aaText shouldn't persist between look and feels, reset it.
    aaTextInfo =
        UIManager.getDefaults().get(SwingUtilities2.AA_TEXT_PROPERTY_KEY);
    ComponentUI oldUI = ui;
    ui = newUI;
    if (ui != null) {
      ui.installUI(this);
    }

    firePropertyChange("UI", oldUI, newUI);
    revalidate();
    repaint();
  }

  /**
   * Uninstalls the UI, if any, and any client properties designated
   * as being specific to the installed UI - instances of
   * {@code UIClientPropertyKey}.
   */
  private void uninstallUIAndProperties() {
    if (ui != null) {
      ui.uninstallUI(this);
      //clean UIClientPropertyKeys from client properties
      if (clientProperties != null) {
        synchronized (clientProperties) {
          Object[] clientPropertyKeys =
              clientProperties.getKeys(null);
          if (clientPropertyKeys != null) {
            for (Object key : clientPropertyKeys) {
              if (key instanceof UIClientPropertyKey) {
                putClientProperty(key, null);
              }
            }
          }
        }
      }
    }
  }

  /**
   * Returns the <code>UIDefaults</code> key used to
   * look up the name of the <code>swing.plaf.ComponentUI</code>
   * class that defines the look and feel
   * for this component.  Most applications will never need to
   * call this method.  Subclasses of <code>JComponent</code> that support
   * pluggable look and feel should override this method to
   * return a <code>UIDefaults</code> key that maps to the
   * <code>ComponentUI</code> subclass that defines their look and feel.
   *
   * @return the <code>UIDefaults</code> key for a <code>ComponentUI</code> subclass
   * @beaninfo expert: true description: UIClassID
   * @see UIDefaults#getUI
   */
  public String getUIClassID() {
    return uiClassID;
  }


  /**
   * Returns the graphics object used to paint this component.
   * If <code>DebugGraphics</code> is turned on we create a new
   * <code>DebugGraphics</code> object if necessary.
   * Otherwise we just configure the
   * specified graphics object's foreground and font.
   *
   * @param g the original <code>Graphics</code> object
   * @return a <code>Graphics</code> object configured for this component
   */
  protected Graphics getComponentGraphics(Graphics g) {
    Graphics componentGraphics = g;
    if (ui != null && DEBUG_GRAPHICS_LOADED) {
      if ((DebugGraphics.debugComponentCount() != 0) &&
          (shouldDebugGraphics() != 0) &&
          !(g instanceof DebugGraphics)) {
        componentGraphics = new DebugGraphics(g, this);
      }
    }
    componentGraphics.setColor(getForeground());
    componentGraphics.setFont(getFont());

    return componentGraphics;
  }


  /**
   * Calls the UI delegate's paint method, if the UI delegate
   * is non-<code>null</code>.  We pass the delegate a copy of the
   * <code>Graphics</code> object to protect the rest of the
   * paint code from irrevocable changes
   * (for example, <code>Graphics.translate</code>).
   * <p>
   * If you override this in a subclass you should not make permanent
   * changes to the passed in <code>Graphics</code>. For example, you
   * should not alter the clip <code>Rectangle</code> or modify the
   * transform. If you need to do these operations you may find it
   * easier to create a new <code>Graphics</code> from the passed in
   * <code>Graphics</code> and manipulate it. Further, if you do not
   * invoker super's implementation you must honor the opaque property,
   * that is
   * if this component is opaque, you must completely fill in the background
   * in a non-opaque color. If you do not honor the opaque property you
   * will likely see visual artifacts.
   * <p>
   * The passed in <code>Graphics</code> object might
   * have a transform other than the identify transform
   * installed on it.  In this case, you might get
   * unexpected results if you cumulatively apply
   * another transform.
   *
   * @param g the <code>Graphics</code> object to protect
   * @see #paint
   * @see ComponentUI
   */
  protected void paintComponent(Graphics g) {
    if (ui != null) {
      Graphics scratchGraphics = (g == null) ? null : g.create();
      try {
        ui.update(scratchGraphics, this);
      } finally {
        scratchGraphics.dispose();
      }
    }
  }

  /**
   * Paints this component's children.
   * If <code>shouldUseBuffer</code> is true,
   * no component ancestor has a buffer and
   * the component children can use a buffer if they have one.
   * Otherwise, one ancestor has a buffer currently in use and children
   * should not use a buffer to paint.
   *
   * @param g the <code>Graphics</code> context in which to paint
   * @see #paint
   * @see java.awt.Container#paint
   */
  protected void paintChildren(Graphics g) {
    Graphics sg = g;

    synchronized (getTreeLock()) {
      int i = getComponentCount() - 1;
      if (i < 0) {
        return;
      }
      // If we are only to paint to a specific child, determine
      // its index.
      if (paintingChild != null &&
          (paintingChild instanceof JComponent) &&
          paintingChild.isOpaque()) {
        for (; i >= 0; i--) {
          if (getComponent(i) == paintingChild) {
            break;
          }
        }
      }
      Rectangle tmpRect = fetchRectangle();
      boolean checkSiblings = (!isOptimizedDrawingEnabled() &&
          checkIfChildObscuredBySibling());
      Rectangle clipBounds = null;
      if (checkSiblings) {
        clipBounds = sg.getClipBounds();
        if (clipBounds == null) {
          clipBounds = new Rectangle(0, 0, getWidth(),
              getHeight());
        }
      }
      boolean printing = getFlag(IS_PRINTING);
      final Window window = SwingUtilities.getWindowAncestor(this);
      final boolean isWindowOpaque = window == null || window.isOpaque();
      for (; i >= 0; i--) {
        Component comp = getComponent(i);
        if (comp == null) {
          continue;
        }

        final boolean isJComponent = comp instanceof JComponent;

        // Enable painting of heavyweights in non-opaque windows.
        // See 6884960
        if ((!isWindowOpaque || isJComponent ||
            isLightweightComponent(comp)) && comp.isVisible()) {
          Rectangle cr;

          cr = comp.getBounds(tmpRect);

          boolean hitClip = g.hitClip(cr.x, cr.y, cr.width,
              cr.height);

          if (hitClip) {
            if (checkSiblings && i > 0) {
              int x = cr.x;
              int y = cr.y;
              int width = cr.width;
              int height = cr.height;
              SwingUtilities.computeIntersection
                  (clipBounds.x, clipBounds.y,
                      clipBounds.width, clipBounds.height, cr);

              if (getObscuredState(i, cr.x, cr.y, cr.width,
                  cr.height) == COMPLETELY_OBSCURED) {
                continue;
              }
              cr.x = x;
              cr.y = y;
              cr.width = width;
              cr.height = height;
            }
            Graphics cg = sg.create(cr.x, cr.y, cr.width,
                cr.height);
            cg.setColor(comp.getForeground());
            cg.setFont(comp.getFont());
            boolean shouldSetFlagBack = false;
            try {
              if (isJComponent) {
                if (getFlag(ANCESTOR_USING_BUFFER)) {
                  ((JComponent) comp).setFlag(
                      ANCESTOR_USING_BUFFER, true);
                  shouldSetFlagBack = true;
                }
                if (getFlag(IS_PAINTING_TILE)) {
                  ((JComponent) comp).setFlag(
                      IS_PAINTING_TILE, true);
                  shouldSetFlagBack = true;
                }
                if (!printing) {
                  comp.paint(cg);
                } else {
                  if (!getFlag(IS_PRINTING_ALL)) {
                    comp.print(cg);
                  } else {
                    comp.printAll(cg);
                  }
                }
              } else {
                // The component is either lightweight, or
                // heavyweight in a non-opaque window
                if (!printing) {
                  comp.paint(cg);
                } else {
                  if (!getFlag(IS_PRINTING_ALL)) {
                    comp.print(cg);
                  } else {
                    comp.printAll(cg);
                  }
                }
              }
            } finally {
              cg.dispose();
              if (shouldSetFlagBack) {
                ((JComponent) comp).setFlag(
                    ANCESTOR_USING_BUFFER, false);
                ((JComponent) comp).setFlag(
                    IS_PAINTING_TILE, false);
              }
            }
          }
        }

      }
      recycleRectangle(tmpRect);
    }
  }

  /**
   * Paints the component's border.
   * <p>
   * If you override this in a subclass you should not make permanent
   * changes to the passed in <code>Graphics</code>. For example, you
   * should not alter the clip <code>Rectangle</code> or modify the
   * transform. If you need to do these operations you may find it
   * easier to create a new <code>Graphics</code> from the passed in
   * <code>Graphics</code> and manipulate it.
   *
   * @param g the <code>Graphics</code> context in which to paint
   * @see #paint
   * @see #setBorder
   */
  protected void paintBorder(Graphics g) {
    Border border = getBorder();
    if (border != null) {
      border.paintBorder(this, g, 0, 0, getWidth(), getHeight());
    }
  }


  /**
   * Calls <code>paint</code>.  Doesn't clear the background but see
   * <code>ComponentUI.update</code>, which is called by
   * <code>paintComponent</code>.
   *
   * @param g the <code>Graphics</code> context in which to paint
   * @see #paint
   * @see #paintComponent
   * @see javax.swing.plaf.ComponentUI
   */
  public void update(Graphics g) {
    paint(g);
  }


  /**
   * Invoked by Swing to draw components.
   * Applications should not invoke <code>paint</code> directly,
   * but should instead use the <code>repaint</code> method to
   * schedule the component for redrawing.
   * <p>
   * This method actually delegates the work of painting to three
   * protected methods: <code>paintComponent</code>,
   * <code>paintBorder</code>,
   * and <code>paintChildren</code>.  They're called in the order
   * listed to ensure that children appear on top of component itself.
   * Generally speaking, the component and its children should not
   * paint in the insets area allocated to the border. Subclasses can
   * just override this method, as always.  A subclass that just
   * wants to specialize the UI (look and feel) delegate's
   * <code>paint</code> method should just override
   * <code>paintComponent</code>.
   *
   * @param g the <code>Graphics</code> context in which to paint
   * @see #paintComponent
   * @see #paintBorder
   * @see #paintChildren
   * @see #getComponentGraphics
   * @see #repaint
   */
  public void paint(Graphics g) {
    boolean shouldClearPaintFlags = false;

    if ((getWidth() <= 0) || (getHeight() <= 0)) {
      return;
    }

    Graphics componentGraphics = getComponentGraphics(g);
    Graphics co = componentGraphics.create();
    try {
      RepaintManager repaintManager = RepaintManager.currentManager(this);
      Rectangle clipRect = co.getClipBounds();
      int clipX;
      int clipY;
      int clipW;
      int clipH;
      if (clipRect == null) {
        clipX = clipY = 0;
        clipW = getWidth();
        clipH = getHeight();
      } else {
        clipX = clipRect.x;
        clipY = clipRect.y;
        clipW = clipRect.width;
        clipH = clipRect.height;
      }

      if (clipW > getWidth()) {
        clipW = getWidth();
      }
      if (clipH > getHeight()) {
        clipH = getHeight();
      }

      if (getParent() != null && !(getParent() instanceof JComponent)) {
        adjustPaintFlags();
        shouldClearPaintFlags = true;
      }

      int bw, bh;
      boolean printing = getFlag(IS_PRINTING);
      if (!printing && repaintManager.isDoubleBufferingEnabled() &&
          !getFlag(ANCESTOR_USING_BUFFER) && isDoubleBuffered() &&
          (getFlag(IS_REPAINTING) || repaintManager.isPainting())) {
        repaintManager.beginPaint();
        try {
          repaintManager.paint(this, this, co, clipX, clipY, clipW,
              clipH);
        } finally {
          repaintManager.endPaint();
        }
      } else {
        // Will ocassionaly happen in 1.2, especially when printing.
        if (clipRect == null) {
          co.setClip(clipX, clipY, clipW, clipH);
        }

        if (!rectangleIsObscured(clipX, clipY, clipW, clipH)) {
          if (!printing) {
            paintComponent(co);
            paintBorder(co);
          } else {
            printComponent(co);
            printBorder(co);
          }
        }
        if (!printing) {
          paintChildren(co);
        } else {
          printChildren(co);
        }
      }
    } finally {
      co.dispose();
      if (shouldClearPaintFlags) {
        setFlag(ANCESTOR_USING_BUFFER, false);
        setFlag(IS_PAINTING_TILE, false);
        setFlag(IS_PRINTING, false);
        setFlag(IS_PRINTING_ALL, false);
      }
    }
  }

  // paint forcing use of the double buffer.  This is used for historical
  // reasons: JViewport, when scrolling, previously directly invoked paint
  // while turning off double buffering at the RepaintManager level, this
  // codes simulates that.
  void paintForceDoubleBuffered(Graphics g) {
    RepaintManager rm = RepaintManager.currentManager(this);
    Rectangle clip = g.getClipBounds();
    rm.beginPaint();
    setFlag(IS_REPAINTING, true);
    try {
      rm.paint(this, this, g, clip.x, clip.y, clip.width, clip.height);
    } finally {
      rm.endPaint();
      setFlag(IS_REPAINTING, false);
    }
  }

  /**
   * Returns true if this component, or any of its ancestors, are in
   * the processing of painting.
   */
  boolean isPainting() {
    Container component = this;
    while (component != null) {
      if (component instanceof JComponent &&
          ((JComponent) component).getFlag(ANCESTOR_USING_BUFFER)) {
        return true;
      }
      component = component.getParent();
    }
    return false;
  }

  private void adjustPaintFlags() {
    JComponent jparent;
    Container parent;
    for (parent = getParent(); parent != null; parent =
        parent.getParent()) {
      if (parent instanceof JComponent) {
        jparent = (JComponent) parent;
        if (jparent.getFlag(ANCESTOR_USING_BUFFER)) {
          setFlag(ANCESTOR_USING_BUFFER, true);
        }
        if (jparent.getFlag(IS_PAINTING_TILE)) {
          setFlag(IS_PAINTING_TILE, true);
        }
        if (jparent.getFlag(IS_PRINTING)) {
          setFlag(IS_PRINTING, true);
        }
        if (jparent.getFlag(IS_PRINTING_ALL)) {
          setFlag(IS_PRINTING_ALL, true);
        }
        break;
      }
    }
  }

  /**
   * Invoke this method to print the component. This method invokes
   * <code>print</code> on the component.
   *
   * @param g the <code>Graphics</code> context in which to paint
   * @see #print
   * @see #printComponent
   * @see #printBorder
   * @see #printChildren
   */
  public void printAll(Graphics g) {
    setFlag(IS_PRINTING_ALL, true);
    try {
      print(g);
    } finally {
      setFlag(IS_PRINTING_ALL, false);
    }
  }

  /**
   * Invoke this method to print the component to the specified
   * <code>Graphics</code>. This method will result in invocations
   * of <code>printComponent</code>, <code>printBorder</code> and
   * <code>printChildren</code>. It is recommended that you override
   * one of the previously mentioned methods rather than this one if
   * your intention is to customize the way printing looks. However,
   * it can be useful to override this method should you want to prepare
   * state before invoking the superclass behavior. As an example,
   * if you wanted to change the component's background color before
   * printing, you could do the following:
   * <pre>
   *     public void print(Graphics g) {
   *         Color orig = getBackground();
   *         setBackground(Color.WHITE);
   *
   *         // wrap in try/finally so that we always restore the state
   *         try {
   *             super.print(g);
   *         } finally {
   *             setBackground(orig);
   *         }
   *     }
   * </pre>
   * <p>
   * Alternatively, or for components that delegate painting to other objects,
   * you can query during painting whether or not the component is in the
   * midst of a print operation. The <code>isPaintingForPrint</code> method provides
   * this ability and its return value will be changed by this method: to
   * <code>true</code> immediately before rendering and to <code>false</code>
   * immediately after. With each change a property change event is fired on
   * this component with the name <code>"paintingForPrint"</code>.
   * <p>
   * This method sets the component's state such that the double buffer
   * will not be used: painting will be done directly on the passed in
   * <code>Graphics</code>.
   *
   * @param g the <code>Graphics</code> context in which to paint
   * @see #printComponent
   * @see #printBorder
   * @see #printChildren
   * @see #isPaintingForPrint
   */
  public void print(Graphics g) {
    setFlag(IS_PRINTING, true);
    firePropertyChange("paintingForPrint", false, true);
    try {
      paint(g);
    } finally {
      setFlag(IS_PRINTING, false);
      firePropertyChange("paintingForPrint", true, false);
    }
  }

  /**
   * This is invoked during a printing operation. This is implemented to
   * invoke <code>paintComponent</code> on the component. Override this
   * if you wish to add special painting behavior when printing.
   *
   * @param g the <code>Graphics</code> context in which to paint
   * @see #print
   * @since 1.3
   */
  protected void printComponent(Graphics g) {
    paintComponent(g);
  }

  /**
   * Prints this component's children. This is implemented to invoke
   * <code>paintChildren</code> on the component. Override this if you
   * wish to print the children differently than painting.
   *
   * @param g the <code>Graphics</code> context in which to paint
   * @see #print
   * @since 1.3
   */
  protected void printChildren(Graphics g) {
    paintChildren(g);
  }

  /**
   * Prints the component's border. This is implemented to invoke
   * <code>paintBorder</code> on the component. Override this if you
   * wish to print the border differently that it is painted.
   *
   * @param g the <code>Graphics</code> context in which to paint
   * @see #print
   * @since 1.3
   */
  protected void printBorder(Graphics g) {
    paintBorder(g);
  }

  /**
   * Returns true if the component is currently painting a tile.
   * If this method returns true, paint will be called again for another
   * tile. This method returns false if you are not painting a tile or
   * if the last tile is painted.
   * Use this method to keep some state you might need between tiles.
   *
   * @return true if the component is currently painting a tile, false otherwise
   */
  public boolean isPaintingTile() {
    return getFlag(IS_PAINTING_TILE);
  }

  /**
   * Returns <code>true</code> if the current painting operation on this
   * component is part of a <code>print</code> operation. This method is
   * useful when you want to customize what you print versus what you show
   * on the screen.
   * <p>
   * You can detect changes in the value of this property by listening for
   * property change events on this component with name
   * <code>"paintingForPrint"</code>.
   * <p>
   * Note: This method provides complimentary functionality to that provided
   * by other high level Swing printing APIs. However, it deals strictly with
   * painting and should not be confused as providing information on higher
   * level print processes. For example, a {@link javax.swing.JTable#print()}
   * operation doesn't necessarily result in a continuous rendering of the
   * full component, and the return value of this method can change multiple
   * times during that operation. It is even possible for the component to be
   * painted to the screen while the printing process is ongoing. In such a
   * case, the return value of this method is <code>true</code> when, and only
   * when, the table is being painted as part of the printing process.
   *
   * @return true if the current painting operation on this component is part of a print operation
   * @see #print
   * @since 1.6
   */
  public final boolean isPaintingForPrint() {
    return getFlag(IS_PRINTING);
  }

  /**
   * In release 1.4, the focus subsystem was rearchitected.
   * For more information, see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>.
   * <p>
   * Changes this <code>JComponent</code>'s focus traversal keys to
   * CTRL+TAB and CTRL+SHIFT+TAB. Also prevents
   * <code>SortingFocusTraversalPolicy</code> from considering descendants
   * of this JComponent when computing a focus traversal cycle.
   *
   * @see java.awt.Component#setFocusTraversalKeys
   * @see SortingFocusTraversalPolicy
   * @deprecated As of 1.4, replaced by <code>Component.setFocusTraversalKeys(int, Set)</code> and
   * <code>Container.setFocusCycleRoot(boolean)</code>.
   */
  @Deprecated
  public boolean isManagingFocus() {
    return false;
  }

  private void registerNextFocusableComponent() {
    registerNextFocusableComponent(getNextFocusableComponent());
  }

  private void registerNextFocusableComponent(Component
      nextFocusableComponent) {
    if (nextFocusableComponent == null) {
      return;
    }

    Container nearestRoot =
        (isFocusCycleRoot()) ? this : getFocusCycleRootAncestor();
    FocusTraversalPolicy policy = nearestRoot.getFocusTraversalPolicy();
    if (!(policy instanceof LegacyGlueFocusTraversalPolicy)) {
      policy = new LegacyGlueFocusTraversalPolicy(policy);
      nearestRoot.setFocusTraversalPolicy(policy);
    }
    ((LegacyGlueFocusTraversalPolicy) policy).
        setNextFocusableComponent(this, nextFocusableComponent);
  }

  private void deregisterNextFocusableComponent() {
    Component nextFocusableComponent = getNextFocusableComponent();
    if (nextFocusableComponent == null) {
      return;
    }

    Container nearestRoot =
        (isFocusCycleRoot()) ? this : getFocusCycleRootAncestor();
    if (nearestRoot == null) {
      return;
    }
    FocusTraversalPolicy policy = nearestRoot.getFocusTraversalPolicy();
    if (policy instanceof LegacyGlueFocusTraversalPolicy) {
      ((LegacyGlueFocusTraversalPolicy) policy).
          unsetNextFocusableComponent(this, nextFocusableComponent);
    }
  }

  /**
   * In release 1.4, the focus subsystem was rearchitected.
   * For more information, see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>.
   * <p>
   * Overrides the default <code>FocusTraversalPolicy</code> for this
   * <code>JComponent</code>'s focus traversal cycle by unconditionally
   * setting the specified <code>Component</code> as the next
   * <code>Component</code> in the cycle, and this <code>JComponent</code>
   * as the specified <code>Component</code>'s previous
   * <code>Component</code> in the cycle.
   *
   * @param aComponent the <code>Component</code> that should follow this <code>JComponent</code> in
   * the focus traversal cycle
   * @see #getNextFocusableComponent
   * @see java.awt.FocusTraversalPolicy
   * @deprecated As of 1.4, replaced by <code>FocusTraversalPolicy</code>
   */
  @Deprecated
  public void setNextFocusableComponent(Component aComponent) {
    boolean displayable = isDisplayable();
    if (displayable) {
      deregisterNextFocusableComponent();
    }
    putClientProperty(NEXT_FOCUS, aComponent);
    if (displayable) {
      registerNextFocusableComponent(aComponent);
    }
  }

  /**
   * In release 1.4, the focus subsystem was rearchitected.
   * For more information, see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>.
   * <p>
   * Returns the <code>Component</code> set by a prior call to
   * <code>setNextFocusableComponent(Component)</code> on this
   * <code>JComponent</code>.
   *
   * @return the <code>Component</code> that will follow this <code>JComponent</code> in the focus
   * traversal cycle, or <code>null</code> if none has been explicitly specified
   * @see #setNextFocusableComponent
   * @deprecated As of 1.4, replaced by <code>FocusTraversalPolicy</code>.
   */
  @Deprecated
  public Component getNextFocusableComponent() {
    return (Component) getClientProperty(NEXT_FOCUS);
  }

  /**
   * Provides a hint as to whether or not this <code>JComponent</code>
   * should get focus. This is only a hint, and it is up to consumers that
   * are requesting focus to honor this property. This is typically honored
   * for mouse operations, but not keyboard operations. For example, look
   * and feels could verify this property is true before requesting focus
   * during a mouse operation. This would often times be used if you did
   * not want a mouse press on a <code>JComponent</code> to steal focus,
   * but did want the <code>JComponent</code> to be traversable via the
   * keyboard. If you do not want this <code>JComponent</code> focusable at
   * all, use the <code>setFocusable</code> method instead.
   * <p>
   * Please see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>,
   * for more information.
   *
   * @param requestFocusEnabled indicates whether you want this <code>JComponent</code> to be
   * focusable or not
   * @see <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
   * @see java.awt.Component#setFocusable
   */
  public void setRequestFocusEnabled(boolean requestFocusEnabled) {
    setFlag(REQUEST_FOCUS_DISABLED, !requestFocusEnabled);
  }

  /**
   * Returns <code>true</code> if this <code>JComponent</code> should
   * get focus; otherwise returns <code>false</code>.
   * <p>
   * Please see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>,
   * for more information.
   *
   * @return <code>true</code> if this component should get focus, otherwise returns
   * <code>false</code>
   * @see #setRequestFocusEnabled
   * @see <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
   * @see java.awt.Component#isFocusable
   */
  public boolean isRequestFocusEnabled() {
    return !getFlag(REQUEST_FOCUS_DISABLED);
  }

  /**
   * Requests that this <code>Component</code> gets the input focus.
   * Refer to {@link java.awt.Component#requestFocus()
   * Component.requestFocus()} for a complete description of
   * this method.
   * <p>
   * Note that the use of this method is discouraged because
   * its behavior is platform dependent. Instead we recommend the
   * use of {@link #requestFocusInWindow() requestFocusInWindow()}.
   * If you would like more information on focus, see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>.
   *
   * @see java.awt.Component#requestFocusInWindow()
   * @see java.awt.Component#requestFocusInWindow(boolean)
   * @since 1.4
   */
  public void requestFocus() {
    super.requestFocus();
  }

  /**
   * Requests that this <code>Component</code> gets the input focus.
   * Refer to {@link java.awt.Component#requestFocus(boolean)
   * Component.requestFocus(boolean)} for a complete description of
   * this method.
   * <p>
   * Note that the use of this method is discouraged because
   * its behavior is platform dependent. Instead we recommend the
   * use of {@link #requestFocusInWindow(boolean)
   * requestFocusInWindow(boolean)}.
   * If you would like more information on focus, see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>.
   *
   * @param temporary boolean indicating if the focus change is temporary
   * @return <code>false</code> if the focus change request is guaranteed to fail; <code>true</code>
   * if it is likely to succeed
   * @see java.awt.Component#requestFocusInWindow()
   * @see java.awt.Component#requestFocusInWindow(boolean)
   * @since 1.4
   */
  public boolean requestFocus(boolean temporary) {
    return super.requestFocus(temporary);
  }

  /**
   * Requests that this <code>Component</code> gets the input focus.
   * Refer to {@link java.awt.Component#requestFocusInWindow()
   * Component.requestFocusInWindow()} for a complete description of
   * this method.
   * <p>
   * If you would like more information on focus, see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>.
   *
   * @return <code>false</code> if the focus change request is guaranteed to fail; <code>true</code>
   * if it is likely to succeed
   * @see java.awt.Component#requestFocusInWindow()
   * @see java.awt.Component#requestFocusInWindow(boolean)
   * @since 1.4
   */
  public boolean requestFocusInWindow() {
    return super.requestFocusInWindow();
  }

  /**
   * Requests that this <code>Component</code> gets the input focus.
   * Refer to {@link java.awt.Component#requestFocusInWindow(boolean)
   * Component.requestFocusInWindow(boolean)} for a complete description of
   * this method.
   * <p>
   * If you would like more information on focus, see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>.
   *
   * @param temporary boolean indicating if the focus change is temporary
   * @return <code>false</code> if the focus change request is guaranteed to fail; <code>true</code>
   * if it is likely to succeed
   * @see java.awt.Component#requestFocusInWindow()
   * @see java.awt.Component#requestFocusInWindow(boolean)
   * @since 1.4
   */
  protected boolean requestFocusInWindow(boolean temporary) {
    return super.requestFocusInWindow(temporary);
  }

  /**
   * Requests that this Component get the input focus, and that this
   * Component's top-level ancestor become the focused Window. This component
   * must be displayable, visible, and focusable for the request to be
   * granted.
   * <p>
   * This method is intended for use by focus implementations. Client code
   * should not use this method; instead, it should use
   * <code>requestFocusInWindow()</code>.
   *
   * @see #requestFocusInWindow()
   */
  public void grabFocus() {
    requestFocus();
  }

  /**
   * Sets the value to indicate whether input verifier for the
   * current focus owner will be called before this component requests
   * focus. The default is true. Set to false on components such as a
   * Cancel button or a scrollbar, which should activate even if the
   * input in the current focus owner is not "passed" by the input
   * verifier for that component.
   *
   * @param verifyInputWhenFocusTarget value for the <code>verifyInputWhenFocusTarget</code>
   * property
   * @beaninfo bound: true description: Whether the Component verifies input before accepting
   * focus.
   * @see InputVerifier
   * @see #setInputVerifier
   * @see #getInputVerifier
   * @see #getVerifyInputWhenFocusTarget
   * @since 1.3
   */
  public void setVerifyInputWhenFocusTarget(boolean
      verifyInputWhenFocusTarget) {
    boolean oldVerifyInputWhenFocusTarget =
        this.verifyInputWhenFocusTarget;
    this.verifyInputWhenFocusTarget = verifyInputWhenFocusTarget;
    firePropertyChange("verifyInputWhenFocusTarget",
        oldVerifyInputWhenFocusTarget,
        verifyInputWhenFocusTarget);
  }

  /**
   * Returns the value that indicates whether the input verifier for the
   * current focus owner will be called before this component requests
   * focus.
   *
   * @return value of the <code>verifyInputWhenFocusTarget</code> property
   * @see InputVerifier
   * @see #setInputVerifier
   * @see #getInputVerifier
   * @see #setVerifyInputWhenFocusTarget
   * @since 1.3
   */
  public boolean getVerifyInputWhenFocusTarget() {
    return verifyInputWhenFocusTarget;
  }


  /**
   * Gets the <code>FontMetrics</code> for the specified <code>Font</code>.
   *
   * @param font the font for which font metrics is to be obtained
   * @return the font metrics for <code>font</code>
   * @throws NullPointerException if <code>font</code> is null
   * @since 1.5
   */
  public FontMetrics getFontMetrics(Font font) {
    return SwingUtilities2.getFontMetrics(this, font);
  }


  /**
   * Sets the preferred size of this component.
   * If <code>preferredSize</code> is <code>null</code>, the UI will
   * be asked for the preferred size.
   *
   * @beaninfo preferred: true bound: true description: The preferred size of the component.
   */
  public void setPreferredSize(Dimension preferredSize) {
    super.setPreferredSize(preferredSize);
  }


  /**
   * If the <code>preferredSize</code> has been set to a
   * non-<code>null</code> value just returns it.
   * If the UI delegate's <code>getPreferredSize</code>
   * method returns a non <code>null</code> value then return that;
   * otherwise defer to the component's layout manager.
   *
   * @return the value of the <code>preferredSize</code> property
   * @see #setPreferredSize
   * @see ComponentUI
   */
  @Transient
  public Dimension getPreferredSize() {
    if (isPreferredSizeSet()) {
      return super.getPreferredSize();
    }
    Dimension size = null;
    if (ui != null) {
      size = ui.getPreferredSize(this);
    }
    return (size != null) ? size : super.getPreferredSize();
  }


  /**
   * Sets the maximum size of this component to a constant
   * value.  Subsequent calls to <code>getMaximumSize</code> will always
   * return this value; the component's UI will not be asked
   * to compute it.  Setting the maximum size to <code>null</code>
   * restores the default behavior.
   *
   * @param maximumSize a <code>Dimension</code> containing the desired maximum allowable size
   * @beaninfo bound: true description: The maximum size of the component.
   * @see #getMaximumSize
   */
  public void setMaximumSize(Dimension maximumSize) {
    super.setMaximumSize(maximumSize);
  }


  /**
   * If the maximum size has been set to a non-<code>null</code> value
   * just returns it.  If the UI delegate's <code>getMaximumSize</code>
   * method returns a non-<code>null</code> value then return that;
   * otherwise defer to the component's layout manager.
   *
   * @return the value of the <code>maximumSize</code> property
   * @see #setMaximumSize
   * @see ComponentUI
   */
  @Transient
  public Dimension getMaximumSize() {
    if (isMaximumSizeSet()) {
      return super.getMaximumSize();
    }
    Dimension size = null;
    if (ui != null) {
      size = ui.getMaximumSize(this);
    }
    return (size != null) ? size : super.getMaximumSize();
  }


  /**
   * Sets the minimum size of this component to a constant
   * value.  Subsequent calls to <code>getMinimumSize</code> will always
   * return this value; the component's UI will not be asked
   * to compute it.  Setting the minimum size to <code>null</code>
   * restores the default behavior.
   *
   * @param minimumSize the new minimum size of this component
   * @beaninfo bound: true description: The minimum size of the component.
   * @see #getMinimumSize
   */
  public void setMinimumSize(Dimension minimumSize) {
    super.setMinimumSize(minimumSize);
  }

  /**
   * If the minimum size has been set to a non-<code>null</code> value
   * just returns it.  If the UI delegate's <code>getMinimumSize</code>
   * method returns a non-<code>null</code> value then return that; otherwise
   * defer to the component's layout manager.
   *
   * @return the value of the <code>minimumSize</code> property
   * @see #setMinimumSize
   * @see ComponentUI
   */
  @Transient
  public Dimension getMinimumSize() {
    if (isMinimumSizeSet()) {
      return super.getMinimumSize();
    }
    Dimension size = null;
    if (ui != null) {
      size = ui.getMinimumSize(this);
    }
    return (size != null) ? size : super.getMinimumSize();
  }

  /**
   * Gives the UI delegate an opportunity to define the precise
   * shape of this component for the sake of mouse processing.
   *
   * @return true if this component logically contains x,y
   * @see java.awt.Component#contains(int, int)
   * @see ComponentUI
   */
  public boolean contains(int x, int y) {
    return (ui != null) ? ui.contains(this, x, y) : super.contains(x, y);
  }

  /**
   * Sets the border of this component.  The <code>Border</code> object is
   * responsible for defining the insets for the component
   * (overriding any insets set directly on the component) and
   * for optionally rendering any border decorations within the
   * bounds of those insets.  Borders should be used (rather
   * than insets) for creating both decorative and non-decorative
   * (such as margins and padding) regions for a swing component.
   * Compound borders can be used to nest multiple borders within a
   * single component.
   * <p>
   * Although technically you can set the border on any object
   * that inherits from <code>JComponent</code>, the look and
   * feel implementation of many standard Swing components
   * doesn't work well with user-set borders.  In general,
   * when you want to set a border on a standard Swing
   * component other than <code>JPanel</code> or <code>JLabel</code>,
   * we recommend that you put the component in a <code>JPanel</code>
   * and set the border on the <code>JPanel</code>.
   * <p>
   * This is a bound property.
   *
   * @param border the border to be rendered for this component
   * @beaninfo bound: true preferred: true attribute: visualUpdate true description: The component's
   * border.
   * @see Border
   * @see CompoundBorder
   */
  public void setBorder(Border border) {
    Border oldBorder = this.border;

    this.border = border;
    firePropertyChange("border", oldBorder, border);
    if (border != oldBorder) {
      if (border == null || oldBorder == null ||
          !(border.getBorderInsets(this).equals(oldBorder.getBorderInsets(this)))) {
        revalidate();
      }
      repaint();
    }
  }

  /**
   * Returns the border of this component or <code>null</code> if no
   * border is currently set.
   *
   * @return the border object for this component
   * @see #setBorder
   */
  public Border getBorder() {
    return border;
  }

  /**
   * If a border has been set on this component, returns the
   * border's insets; otherwise calls <code>super.getInsets</code>.
   *
   * @return the value of the insets property
   * @see #setBorder
   */
  public Insets getInsets() {
    if (border != null) {
      return border.getBorderInsets(this);
    }
    return super.getInsets();
  }

  /**
   * Returns an <code>Insets</code> object containing this component's inset
   * values.  The passed-in <code>Insets</code> object will be reused
   * if possible.
   * Calling methods cannot assume that the same object will be returned,
   * however.  All existing values within this object are overwritten.
   * If <code>insets</code> is null, this will allocate a new one.
   *
   * @param insets the <code>Insets</code> object, which can be reused
   * @return the <code>Insets</code> object
   * @beaninfo expert: true
   * @see #getInsets
   */
  public Insets getInsets(Insets insets) {
    if (insets == null) {
      insets = new Insets(0, 0, 0, 0);
    }
    if (border != null) {
      if (border instanceof AbstractBorder) {
        return ((AbstractBorder) border).getBorderInsets(this, insets);
      } else {
        // Can't reuse border insets because the Border interface
        // can't be enhanced.
        return border.getBorderInsets(this);
      }
    } else {
      // super.getInsets() always returns an Insets object with
      // all of its value zeroed.  No need for a new object here.
      insets.left = insets.top = insets.right = insets.bottom = 0;
      return insets;
    }
  }

  /**
   * Overrides <code>Container.getAlignmentY</code> to return
   * the horizontal alignment.
   *
   * @return the value of the <code>alignmentY</code> property
   * @see #setAlignmentY
   * @see java.awt.Component#getAlignmentY
   */
  public float getAlignmentY() {
    if (isAlignmentYSet) {
      return alignmentY;
    }
    return super.getAlignmentY();
  }

  /**
   * Sets the the horizontal alignment.
   *
   * @param alignmentY the new horizontal alignment
   * @beaninfo description: The preferred vertical alignment of the component.
   * @see #getAlignmentY
   */
  public void setAlignmentY(float alignmentY) {
    this.alignmentY = alignmentY > 1.0f ? 1.0f : alignmentY < 0.0f ? 0.0f : alignmentY;
    isAlignmentYSet = true;
  }


  /**
   * Overrides <code>Container.getAlignmentX</code> to return
   * the vertical alignment.
   *
   * @return the value of the <code>alignmentX</code> property
   * @see #setAlignmentX
   * @see java.awt.Component#getAlignmentX
   */
  public float getAlignmentX() {
    if (isAlignmentXSet) {
      return alignmentX;
    }
    return super.getAlignmentX();
  }

  /**
   * Sets the the vertical alignment.
   *
   * @param alignmentX the new vertical alignment
   * @beaninfo description: The preferred horizontal alignment of the component.
   * @see #getAlignmentX
   */
  public void setAlignmentX(float alignmentX) {
    this.alignmentX = alignmentX > 1.0f ? 1.0f : alignmentX < 0.0f ? 0.0f : alignmentX;
    isAlignmentXSet = true;
  }

  /**
   * Sets the input verifier for this component.
   *
   * @param inputVerifier the new input verifier
   * @beaninfo bound: true description: The component's input verifier.
   * @see InputVerifier
   * @since 1.3
   */
  public void setInputVerifier(InputVerifier inputVerifier) {
    InputVerifier oldInputVerifier = (InputVerifier) getClientProperty(
        JComponent_INPUT_VERIFIER);
    putClientProperty(JComponent_INPUT_VERIFIER, inputVerifier);
    firePropertyChange("inputVerifier", oldInputVerifier, inputVerifier);
  }

  /**
   * Returns the input verifier for this component.
   *
   * @return the <code>inputVerifier</code> property
   * @see InputVerifier
   * @since 1.3
   */
  public InputVerifier getInputVerifier() {
    return (InputVerifier) getClientProperty(JComponent_INPUT_VERIFIER);
  }

  /**
   * Returns this component's graphics context, which lets you draw
   * on a component. Use this method to get a <code>Graphics</code> object and
   * then invoke operations on that object to draw on the component.
   *
   * @return this components graphics context
   */
  public Graphics getGraphics() {
    if (DEBUG_GRAPHICS_LOADED && shouldDebugGraphics() != 0) {
      DebugGraphics graphics = new DebugGraphics(super.getGraphics(),
          this);
      return graphics;
    }
    return super.getGraphics();
  }


  /**
   * Enables or disables diagnostic information about every graphics
   * operation performed within the component or one of its children.
   *
   * @param debugOptions determines how the component should display the information;  one of the
   * following options: <ul> <li>DebugGraphics.LOG_OPTION - causes a text message to be printed.
   * <li>DebugGraphics.FLASH_OPTION - causes the drawing to flash several times.
   * <li>DebugGraphics.BUFFERED_OPTION - creates an <code>ExternalWindow</code> that displays the
   * operations performed on the View's offscreen buffer. <li>DebugGraphics.NONE_OPTION disables
   * debugging. <li>A value of 0 causes no changes to the debugging options. </ul>
   * <code>debugOptions</code> is bitwise OR'd into the current value
   * @beaninfo preferred: true enum: NONE_OPTION DebugGraphics.NONE_OPTION LOG_OPTION
   * DebugGraphics.LOG_OPTION FLASH_OPTION DebugGraphics.FLASH_OPTION BUFFERED_OPTION
   * DebugGraphics.BUFFERED_OPTION description: Diagnostic options for graphics operations.
   */
  public void setDebugGraphicsOptions(int debugOptions) {
    DebugGraphics.setDebugOptions(this, debugOptions);
  }

  /**
   * Returns the state of graphics debugging.
   *
   * @return a bitwise OR'd flag of zero or more of the following options: <ul>
   * <li>DebugGraphics.LOG_OPTION - causes a text message to be printed.
   * <li>DebugGraphics.FLASH_OPTION - causes the drawing to flash several times.
   * <li>DebugGraphics.BUFFERED_OPTION - creates an <code>ExternalWindow</code> that displays the
   * operations performed on the View's offscreen buffer. <li>DebugGraphics.NONE_OPTION disables
   * debugging. <li>A value of 0 causes no changes to the debugging options. </ul>
   * @see #setDebugGraphicsOptions
   */
  public int getDebugGraphicsOptions() {
    return DebugGraphics.getDebugOptions(this);
  }


  /**
   * Returns true if debug information is enabled for this
   * <code>JComponent</code> or one of its parents.
   */
  int shouldDebugGraphics() {
    return DebugGraphics.shouldComponentDebug(this);
  }

  /**
   * This method is now obsolete, please use a combination of
   * <code>getActionMap()</code> and <code>getInputMap()</code> for
   * similar behavior. For example, to bind the <code>KeyStroke</code>
   * <code>aKeyStroke</code> to the <code>Action</code> <code>anAction</code>
   * now use:
   * <pre>
   *   component.getInputMap().put(aKeyStroke, aCommand);
   *   component.getActionMap().put(aCommmand, anAction);
   * </pre>
   * The above assumes you want the binding to be applicable for
   * <code>WHEN_FOCUSED</code>. To register bindings for other focus
   * states use the <code>getInputMap</code> method that takes an integer.
   * <p>
   * Register a new keyboard action.
   * <code>anAction</code> will be invoked if a key event matching
   * <code>aKeyStroke</code> occurs and <code>aCondition</code> is verified.
   * The <code>KeyStroke</code> object defines a
   * particular combination of a keyboard key and one or more modifiers
   * (alt, shift, ctrl, meta).
   * <p>
   * The <code>aCommand</code> will be set in the delivered event if
   * specified.
   * <p>
   * The <code>aCondition</code> can be one of:
   * <blockquote>
   * <DL>
   * <DT>WHEN_FOCUSED
   * <DD>The action will be invoked only when the keystroke occurs
   * while the component has the focus.
   * <DT>WHEN_IN_FOCUSED_WINDOW
   * <DD>The action will be invoked when the keystroke occurs while
   * the component has the focus or if the component is in the
   * window that has the focus. Note that the component need not
   * be an immediate descendent of the window -- it can be
   * anywhere in the window's containment hierarchy. In other
   * words, whenever <em>any</em> component in the window has the focus,
   * the action registered with this component is invoked.
   * <DT>WHEN_ANCESTOR_OF_FOCUSED_COMPONENT
   * <DD>The action will be invoked when the keystroke occurs while the
   * component has the focus or if the component is an ancestor of
   * the component that has the focus.
   * </DL>
   * </blockquote>
   * <p>
   * The combination of keystrokes and conditions lets you define high
   * level (semantic) action events for a specified keystroke+modifier
   * combination (using the KeyStroke class) and direct to a parent or
   * child of a component that has the focus, or to the component itself.
   * In other words, in any hierarchical structure of components, an
   * arbitrary key-combination can be immediately directed to the
   * appropriate component in the hierarchy, and cause a specific method
   * to be invoked (usually by way of adapter objects).
   * <p>
   * If an action has already been registered for the receiving
   * container, with the same charCode and the same modifiers,
   * <code>anAction</code> will replace the action.
   *
   * @param anAction the <code>Action</code> to be registered
   * @param aCommand the command to be set in the delivered event
   * @param aKeyStroke the <code>KeyStroke</code> to bind to the action
   * @param aCondition the condition that needs to be met, see above
   * @see KeyStroke
   */
  public void registerKeyboardAction(ActionListener anAction, String aCommand, KeyStroke aKeyStroke,
      int aCondition) {

    InputMap inputMap = getInputMap(aCondition, true);

    if (inputMap != null) {
      ActionMap actionMap = getActionMap(true);
      ActionStandin action = new ActionStandin(anAction, aCommand);
      inputMap.put(aKeyStroke, action);
      if (actionMap != null) {
        actionMap.put(action, action);
      }
    }
  }

  /**
   * Registers any bound <code>WHEN_IN_FOCUSED_WINDOW</code> actions with
   * the <code>KeyboardManager</code>. If <code>onlyIfNew</code>
   * is true only actions that haven't been registered are pushed
   * to the <code>KeyboardManager</code>;
   * otherwise all actions are pushed to the <code>KeyboardManager</code>.
   *
   * @param onlyIfNew if true, only actions that haven't been registered are pushed to the
   * <code>KeyboardManager</code>
   */
  private void registerWithKeyboardManager(boolean onlyIfNew) {
    InputMap inputMap = getInputMap(WHEN_IN_FOCUSED_WINDOW, false);
    KeyStroke[] strokes;
    Hashtable<KeyStroke, KeyStroke> registered =
        (Hashtable<KeyStroke, KeyStroke>) getClientProperty
            (WHEN_IN_FOCUSED_WINDOW_BINDINGS);

    if (inputMap != null) {
      // Push any new KeyStrokes to the KeyboardManager.
      strokes = inputMap.allKeys();
      if (strokes != null) {
        for (int counter = strokes.length - 1; counter >= 0;
            counter--) {
          if (!onlyIfNew || registered == null ||
              registered.get(strokes[counter]) == null) {
            registerWithKeyboardManager(strokes[counter]);
          }
          if (registered != null) {
            registered.remove(strokes[counter]);
          }
        }
      }
    } else {
      strokes = null;
    }
    // Remove any old ones.
    if (registered != null && registered.size() > 0) {
      Enumeration<KeyStroke> keys = registered.keys();

      while (keys.hasMoreElements()) {
        KeyStroke ks = keys.nextElement();
        unregisterWithKeyboardManager(ks);
      }
      registered.clear();
    }
    // Updated the registered Hashtable.
    if (strokes != null && strokes.length > 0) {
      if (registered == null) {
        registered = new Hashtable<KeyStroke, KeyStroke>(strokes.length);
        putClientProperty(WHEN_IN_FOCUSED_WINDOW_BINDINGS, registered);
      }
      for (int counter = strokes.length - 1; counter >= 0; counter--) {
        registered.put(strokes[counter], strokes[counter]);
      }
    } else {
      putClientProperty(WHEN_IN_FOCUSED_WINDOW_BINDINGS, null);
    }
  }

  /**
   * Unregisters all the previously registered
   * <code>WHEN_IN_FOCUSED_WINDOW</code> <code>KeyStroke</code> bindings.
   */
  private void unregisterWithKeyboardManager() {
    Hashtable<KeyStroke, KeyStroke> registered =
        (Hashtable<KeyStroke, KeyStroke>) getClientProperty
            (WHEN_IN_FOCUSED_WINDOW_BINDINGS);

    if (registered != null && registered.size() > 0) {
      Enumeration<KeyStroke> keys = registered.keys();

      while (keys.hasMoreElements()) {
        KeyStroke ks = keys.nextElement();
        unregisterWithKeyboardManager(ks);
      }
    }
    putClientProperty(WHEN_IN_FOCUSED_WINDOW_BINDINGS, null);
  }

  /**
   * Invoked from <code>ComponentInputMap</code> when its bindings change.
   * If <code>inputMap</code> is the current <code>windowInputMap</code>
   * (or a parent of the window <code>InputMap</code>)
   * the <code>KeyboardManager</code> is notified of the new bindings.
   *
   * @param inputMap the map containing the new bindings
   */
  void componentInputMapChanged(ComponentInputMap inputMap) {
    InputMap km = getInputMap(WHEN_IN_FOCUSED_WINDOW, false);

    while (km != inputMap && km != null) {
      km = km.getParent();
    }
    if (km != null) {
      registerWithKeyboardManager(false);
    }
  }

  private void registerWithKeyboardManager(KeyStroke aKeyStroke) {
    KeyboardManager.getCurrentManager().registerKeyStroke(aKeyStroke, this);
  }

  private void unregisterWithKeyboardManager(KeyStroke aKeyStroke) {
    KeyboardManager.getCurrentManager().unregisterKeyStroke(aKeyStroke,
        this);
  }

  /**
   * This method is now obsolete, please use a combination of
   * <code>getActionMap()</code> and <code>getInputMap()</code> for
   * similar behavior.
   */
  public void registerKeyboardAction(ActionListener anAction, KeyStroke aKeyStroke,
      int aCondition) {
    registerKeyboardAction(anAction, null, aKeyStroke, aCondition);
  }

  /**
   * This method is now obsolete. To unregister an existing binding
   * you can either remove the binding from the
   * <code>ActionMap/InputMap</code>, or place a dummy binding the
   * <code>InputMap</code>. Removing the binding from the
   * <code>InputMap</code> allows bindings in parent <code>InputMap</code>s
   * to be active, whereas putting a dummy binding in the
   * <code>InputMap</code> effectively disables
   * the binding from ever happening.
   * <p>
   * Unregisters a keyboard action.
   * This will remove the binding from the <code>ActionMap</code>
   * (if it exists) as well as the <code>InputMap</code>s.
   */
  public void unregisterKeyboardAction(KeyStroke aKeyStroke) {
    ActionMap am = getActionMap(false);
    for (int counter = 0; counter < 3; counter++) {
      InputMap km = getInputMap(counter, false);
      if (km != null) {
        Object actionID = km.get(aKeyStroke);

        if (am != null && actionID != null) {
          am.remove(actionID);
        }
        km.remove(aKeyStroke);
      }
    }
  }

  /**
   * Returns the <code>KeyStrokes</code> that will initiate
   * registered actions.
   *
   * @return an array of <code>KeyStroke</code> objects
   * @see #registerKeyboardAction
   */
  public KeyStroke[] getRegisteredKeyStrokes() {
    int[] counts = new int[3];
    KeyStroke[][] strokes = new KeyStroke[3][];

    for (int counter = 0; counter < 3; counter++) {
      InputMap km = getInputMap(counter, false);
      strokes[counter] = (km != null) ? km.allKeys() : null;
      counts[counter] = (strokes[counter] != null) ?
          strokes[counter].length : 0;
    }
    KeyStroke[] retValue = new KeyStroke[counts[0] + counts[1] +
        counts[2]];
    for (int counter = 0, last = 0; counter < 3; counter++) {
      if (counts[counter] > 0) {
        System.arraycopy(strokes[counter], 0, retValue, last,
            counts[counter]);
        last += counts[counter];
      }
    }
    return retValue;
  }

  /**
   * Returns the condition that determines whether a registered action
   * occurs in response to the specified keystroke.
   * <p>
   * For Java 2 platform v1.3, a <code>KeyStroke</code> can be associated
   * with more than one condition.
   * For example, 'a' could be bound for the two
   * conditions <code>WHEN_FOCUSED</code> and
   * <code>WHEN_IN_FOCUSED_WINDOW</code> condition.
   *
   * @return the action-keystroke condition
   */
  public int getConditionForKeyStroke(KeyStroke aKeyStroke) {
    for (int counter = 0; counter < 3; counter++) {
      InputMap inputMap = getInputMap(counter, false);
      if (inputMap != null && inputMap.get(aKeyStroke) != null) {
        return counter;
      }
    }
    return UNDEFINED_CONDITION;
  }

  /**
   * Returns the object that will perform the action registered for a
   * given keystroke.
   *
   * @return the <code>ActionListener</code> object invoked when the keystroke occurs
   */
  public ActionListener getActionForKeyStroke(KeyStroke aKeyStroke) {
    ActionMap am = getActionMap(false);

    if (am == null) {
      return null;
    }
    for (int counter = 0; counter < 3; counter++) {
      InputMap inputMap = getInputMap(counter, false);
      if (inputMap != null) {
        Object actionBinding = inputMap.get(aKeyStroke);

        if (actionBinding != null) {
          Action action = am.get(actionBinding);
          if (action instanceof ActionStandin) {
            return ((ActionStandin) action).actionListener;
          }
          return action;
        }
      }
    }
    return null;
  }

  /**
   * Unregisters all the bindings in the first tier <code>InputMaps</code>
   * and <code>ActionMap</code>. This has the effect of removing any
   * local bindings, and allowing the bindings defined in parent
   * <code>InputMap/ActionMaps</code>
   * (the UI is usually defined in the second tier) to persist.
   */
  public void resetKeyboardActions() {
    // Keys
    for (int counter = 0; counter < 3; counter++) {
      InputMap inputMap = getInputMap(counter, false);

      if (inputMap != null) {
        inputMap.clear();
      }
    }

    // Actions
    ActionMap am = getActionMap(false);

    if (am != null) {
      am.clear();
    }
  }

  /**
   * Sets the <code>InputMap</code> to use under the condition
   * <code>condition</code> to
   * <code>map</code>. A <code>null</code> value implies you
   * do not want any bindings to be used, even from the UI. This will
   * not reinstall the UI <code>InputMap</code> (if there was one).
   * <code>condition</code> has one of the following values:
   * <ul>
   * <li><code>WHEN_IN_FOCUSED_WINDOW</code>
   * <li><code>WHEN_FOCUSED</code>
   * <li><code>WHEN_ANCESTOR_OF_FOCUSED_COMPONENT</code>
   * </ul>
   * If <code>condition</code> is <code>WHEN_IN_FOCUSED_WINDOW</code>
   * and <code>map</code> is not a <code>ComponentInputMap</code>, an
   * <code>IllegalArgumentException</code> will be thrown.
   * Similarly, if <code>condition</code> is not one of the values
   * listed, an <code>IllegalArgumentException</code> will be thrown.
   *
   * @param condition one of the values listed above
   * @param map the <code>InputMap</code> to use for the given condition
   * @throws IllegalArgumentException if <code>condition</code> is <code>WHEN_IN_FOCUSED_WINDOW</code>
   * and <code>map</code> is not an instance of <code>ComponentInputMap</code>; or if
   * <code>condition</code> is not one of the legal values specified above
   * @since 1.3
   */
  public final void setInputMap(int condition, InputMap map) {
    switch (condition) {
      case WHEN_IN_FOCUSED_WINDOW:
        if (map != null && !(map instanceof ComponentInputMap)) {
          throw new IllegalArgumentException(
              "WHEN_IN_FOCUSED_WINDOW InputMaps must be of type ComponentInputMap");
        }
        windowInputMap = (ComponentInputMap) map;
        setFlag(WIF_INPUTMAP_CREATED, true);
        registerWithKeyboardManager(false);
        break;
      case WHEN_ANCESTOR_OF_FOCUSED_COMPONENT:
        ancestorInputMap = map;
        setFlag(ANCESTOR_INPUTMAP_CREATED, true);
        break;
      case WHEN_FOCUSED:
        focusInputMap = map;
        setFlag(FOCUS_INPUTMAP_CREATED, true);
        break;
      default:
        throw new IllegalArgumentException(
            "condition must be one of JComponent.WHEN_IN_FOCUSED_WINDOW, JComponent.WHEN_FOCUSED or JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT");
    }
  }

  /**
   * Returns the <code>InputMap</code> that is used during
   * <code>condition</code>.
   *
   * @param condition one of WHEN_IN_FOCUSED_WINDOW, WHEN_FOCUSED, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT
   * @return the <code>InputMap</code> for the specified <code>condition</code>
   * @since 1.3
   */
  public final InputMap getInputMap(int condition) {
    return getInputMap(condition, true);
  }

  /**
   * Returns the <code>InputMap</code> that is used when the
   * component has focus.
   * This is convenience method for <code>getInputMap(WHEN_FOCUSED)</code>.
   *
   * @return the <code>InputMap</code> used when the component has focus
   * @since 1.3
   */
  public final InputMap getInputMap() {
    return getInputMap(WHEN_FOCUSED, true);
  }

  /**
   * Sets the <code>ActionMap</code> to <code>am</code>. This does not set
   * the parent of the <code>am</code> to be the <code>ActionMap</code>
   * from the UI (if there was one), it is up to the caller to have done this.
   *
   * @param am the new <code>ActionMap</code>
   * @since 1.3
   */
  public final void setActionMap(ActionMap am) {
    actionMap = am;
    setFlag(ACTIONMAP_CREATED, true);
  }

  /**
   * Returns the <code>ActionMap</code> used to determine what
   * <code>Action</code> to fire for particular <code>KeyStroke</code>
   * binding. The returned <code>ActionMap</code>, unless otherwise
   * set, will have the <code>ActionMap</code> from the UI set as the parent.
   *
   * @return the <code>ActionMap</code> containing the key/action bindings
   * @since 1.3
   */
  public final ActionMap getActionMap() {
    return getActionMap(true);
  }

  /**
   * Returns the <code>InputMap</code> to use for condition
   * <code>condition</code>.  If the <code>InputMap</code> hasn't
   * been created, and <code>create</code> is
   * true, it will be created.
   *
   * @param condition one of the following values: <ul> <li>JComponent.FOCUS_INPUTMAP_CREATED
   * <li>JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT <li>JComponent.WHEN_IN_FOCUSED_WINDOW </ul>
   * @param create if true, create the <code>InputMap</code> if it is not already created
   * @return the <code>InputMap</code> for the given <code>condition</code>; if <code>create</code>
   * is false and the <code>InputMap</code> hasn't been created, returns <code>null</code>
   * @throws IllegalArgumentException if <code>condition</code> is not one of the legal values
   * listed above
   */
  final InputMap getInputMap(int condition, boolean create) {
    switch (condition) {
      case WHEN_FOCUSED:
        if (getFlag(FOCUS_INPUTMAP_CREATED)) {
          return focusInputMap;
        }
        // Hasn't been created yet.
        if (create) {
          InputMap km = new InputMap();
          setInputMap(condition, km);
          return km;
        }
        break;
      case WHEN_ANCESTOR_OF_FOCUSED_COMPONENT:
        if (getFlag(ANCESTOR_INPUTMAP_CREATED)) {
          return ancestorInputMap;
        }
        // Hasn't been created yet.
        if (create) {
          InputMap km = new InputMap();
          setInputMap(condition, km);
          return km;
        }
        break;
      case WHEN_IN_FOCUSED_WINDOW:
        if (getFlag(WIF_INPUTMAP_CREATED)) {
          return windowInputMap;
        }
        // Hasn't been created yet.
        if (create) {
          ComponentInputMap km = new ComponentInputMap(this);
          setInputMap(condition, km);
          return km;
        }
        break;
      default:
        throw new IllegalArgumentException(
            "condition must be one of JComponent.WHEN_IN_FOCUSED_WINDOW, JComponent.WHEN_FOCUSED or JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT");
    }
    return null;
  }

  /**
   * Finds and returns the appropriate <code>ActionMap</code>.
   *
   * @param create if true, create the <code>ActionMap</code> if it is not already created
   * @return the <code>ActionMap</code> for this component; if the <code>create</code> flag is false
   * and there is no current <code>ActionMap</code>, returns <code>null</code>
   */
  final ActionMap getActionMap(boolean create) {
    if (getFlag(ACTIONMAP_CREATED)) {
      return actionMap;
    }
    // Hasn't been created.
    if (create) {
      ActionMap am = new ActionMap();
      setActionMap(am);
      return am;
    }
    return null;
  }

  /**
   * Returns the baseline.  The baseline is measured from the top of
   * the component.  This method is primarily meant for
   * <code>LayoutManager</code>s to align components along their
   * baseline.  A return value less than 0 indicates this component
   * does not have a reasonable baseline and that
   * <code>LayoutManager</code>s should not align this component on
   * its baseline.
   * <p>
   * This method calls into the <code>ComponentUI</code> method of the
   * same name.  If this component does not have a <code>ComponentUI</code>
   * -1 will be returned.  If a value &gt;= 0 is
   * returned, then the component has a valid baseline for any
   * size &gt;= the minimum size and <code>getBaselineResizeBehavior</code>
   * can be used to determine how the baseline changes with size.
   *
   * @throws IllegalArgumentException {@inheritDoc}
   * @see #getBaselineResizeBehavior
   * @see java.awt.FontMetrics
   * @since 1.6
   */
  public int getBaseline(int width, int height) {
    // check size.
    super.getBaseline(width, height);
    if (ui != null) {
      return ui.getBaseline(this, width, height);
    }
    return -1;
  }

  /**
   * Returns an enum indicating how the baseline of the component
   * changes as the size changes.  This method is primarily meant for
   * layout managers and GUI builders.
   * <p>
   * This method calls into the <code>ComponentUI</code> method of
   * the same name.  If this component does not have a
   * <code>ComponentUI</code>
   * <code>BaselineResizeBehavior.OTHER</code> will be
   * returned.  Subclasses should
   * never return <code>null</code>; if the baseline can not be
   * calculated return <code>BaselineResizeBehavior.OTHER</code>.  Callers
   * should first ask for the baseline using
   * <code>getBaseline</code> and if a value &gt;= 0 is returned use
   * this method.  It is acceptable for this method to return a
   * value other than <code>BaselineResizeBehavior.OTHER</code> even if
   * <code>getBaseline</code> returns a value less than 0.
   *
   * @see #getBaseline(int, int)
   * @since 1.6
   */
  public BaselineResizeBehavior getBaselineResizeBehavior() {
    if (ui != null) {
      return ui.getBaselineResizeBehavior(this);
    }
    return BaselineResizeBehavior.OTHER;
  }

  /**
   * In release 1.4, the focus subsystem was rearchitected.
   * For more information, see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
   * How to Use the Focus Subsystem</a>,
   * a section in <em>The Java Tutorial</em>.
   * <p>
   * Requests focus on this <code>JComponent</code>'s
   * <code>FocusTraversalPolicy</code>'s default <code>Component</code>.
   * If this <code>JComponent</code> is a focus cycle root, then its
   * <code>FocusTraversalPolicy</code> is used. Otherwise, the
   * <code>FocusTraversalPolicy</code> of this <code>JComponent</code>'s
   * focus-cycle-root ancestor is used.
   *
   * @see java.awt.FocusTraversalPolicy#getDefaultComponent
   * @deprecated As of 1.4, replaced by <code>FocusTraversalPolicy.getDefaultComponent(Container).requestFocus()</code>
   */
  @Deprecated
  public boolean requestDefaultFocus() {
    Container nearestRoot =
        (isFocusCycleRoot()) ? this : getFocusCycleRootAncestor();
    if (nearestRoot == null) {
      return false;
    }
    Component comp = nearestRoot.getFocusTraversalPolicy().
        getDefaultComponent(nearestRoot);
    if (comp != null) {
      comp.requestFocus();
      return true;
    } else {
      return false;
    }
  }

  /**
   * Makes the component visible or invisible.
   * Overrides <code>Component.setVisible</code>.
   *
   * @param aFlag true to make the component visible; false to make it invisible
   * @beaninfo attribute: visualUpdate true
   */
  public void setVisible(boolean aFlag) {
    if (aFlag != isVisible()) {
      super.setVisible(aFlag);
      if (aFlag) {
        Container parent = getParent();
        if (parent != null) {
          Rectangle r = getBounds();
          parent.repaint(r.x, r.y, r.width, r.height);
        }
        revalidate();
      }
    }
  }

  /**
   * Sets whether or not this component is enabled.
   * A component that is enabled may respond to user input,
   * while a component that is not enabled cannot respond to
   * user input.  Some components may alter their visual
   * representation when they are disabled in order to
   * provide feedback to the user that they cannot take input.
   * <p>Note: Disabling a component does not disable its children.
   *
   * <p>Note: Disabling a lightweight component does not prevent it from
   * receiving MouseEvents.
   *
   * @param enabled true if this component should be enabled, false otherwise
   * @beaninfo preferred: true bound: true attribute: visualUpdate true description: The enabled
   * state of the component.
   * @see java.awt.Component#isEnabled
   * @see java.awt.Component#isLightweight
   */
  public void setEnabled(boolean enabled) {
    boolean oldEnabled = isEnabled();
    super.setEnabled(enabled);
    firePropertyChange("enabled", oldEnabled, enabled);
    if (enabled != oldEnabled) {
      repaint();
    }
  }

  /**
   * Sets the foreground color of this component.  It is up to the
   * look and feel to honor this property, some may choose to ignore
   * it.
   *
   * @param fg the desired foreground <code>Color</code>
   * @beaninfo preferred: true bound: true attribute: visualUpdate true description: The foreground
   * color of the component.
   * @see java.awt.Component#getForeground
   */
  public void setForeground(Color fg) {
    Color oldFg = getForeground();
    super.setForeground(fg);
    if ((oldFg != null) ? !oldFg.equals(fg) : ((fg != null) && !fg.equals(oldFg))) {
      // foreground already bound in AWT1.2
      repaint();
    }
  }

  /**
   * Sets the background color of this component.  The background
   * color is used only if the component is opaque, and only
   * by subclasses of <code>JComponent</code> or
   * <code>ComponentUI</code> implementations.  Direct subclasses of
   * <code>JComponent</code> must override
   * <code>paintComponent</code> to honor this property.
   * <p>
   * It is up to the look and feel to honor this property, some may
   * choose to ignore it.
   *
   * @param bg the desired background <code>Color</code>
   * @beaninfo preferred: true bound: true attribute: visualUpdate true description: The background
   * color of the component.
   * @see java.awt.Component#getBackground
   * @see #setOpaque
   */
  public void setBackground(Color bg) {
    Color oldBg = getBackground();
    super.setBackground(bg);
    if ((oldBg != null) ? !oldBg.equals(bg) : ((bg != null) && !bg.equals(oldBg))) {
      // background already bound in AWT1.2
      repaint();
    }
  }

  /**
   * Sets the font for this component.
   *
   * @param font the desired <code>Font</code> for this component
   * @beaninfo preferred: true bound: true attribute: visualUpdate true description: The font for
   * the component.
   * @see java.awt.Component#getFont
   */
  public void setFont(Font font) {
    Font oldFont = getFont();
    super.setFont(font);
    // font already bound in AWT1.2
    if (font != oldFont) {
      revalidate();
      repaint();
    }
  }

  /**
   * Returns the default locale used to initialize each JComponent's
   * locale property upon creation.
   *
   * The default locale has "AppContext" scope so that applets (and
   * potentially multiple lightweight applications running in a single VM)
   * can have their own setting. An applet can safely alter its default
   * locale because it will have no affect on other applets (or the browser).
   *
   * @return the default <code>Locale</code>.
   * @see #setDefaultLocale
   * @see java.awt.Component#getLocale
   * @see #setLocale
   * @since 1.4
   */
  static public Locale getDefaultLocale() {
    Locale l = (Locale) SwingUtilities.appContextGet(defaultLocale);
    if (l == null) {
      //REMIND(bcb) choosing the default value is more complicated
      //than this.
      l = Locale.getDefault();
      JComponent.setDefaultLocale(l);
    }
    return l;
  }


  /**
   * Sets the default locale used to initialize each JComponent's locale
   * property upon creation.  The initial value is the VM's default locale.
   *
   * The default locale has "AppContext" scope so that applets (and
   * potentially multiple lightweight applications running in a single VM)
   * can have their own setting. An applet can safely alter its default
   * locale because it will have no affect on other applets (or the browser).
   *
   * @param l the desired default <code>Locale</code> for new components.
   * @see #getDefaultLocale
   * @see java.awt.Component#getLocale
   * @see #setLocale
   * @since 1.4
   */
  static public void setDefaultLocale(Locale l) {
    SwingUtilities.appContextPut(defaultLocale, l);
  }


  /**
   * Processes any key events that the component itself
   * recognizes.  This is called after the focus
   * manager and any interested listeners have been
   * given a chance to steal away the event.  This
   * method is called only if the event has not
   * yet been consumed.  This method is called prior
   * to the keyboard UI logic.
   * <p>
   * This method is implemented to do nothing.  Subclasses would
   * normally override this method if they process some
   * key events themselves.  If the event is processed,
   * it should be consumed.
   */
  protected void processComponentKeyEvent(KeyEvent e) {
  }

  /**
   * Overrides <code>processKeyEvent</code> to process events.
   **/
  protected void processKeyEvent(KeyEvent e) {
    boolean result;
    boolean shouldProcessKey;

    // This gives the key event listeners a crack at the event
    super.processKeyEvent(e);

    // give the component itself a crack at the event
    if (!e.isConsumed()) {
      processComponentKeyEvent(e);
    }

    shouldProcessKey = KeyboardState.shouldProcess(e);

    if (e.isConsumed()) {
      return;
    }

    if (shouldProcessKey && processKeyBindings(e, e.getID() ==
        KeyEvent.KEY_PRESSED)) {
      e.consume();
    }
  }

  /**
   * Invoked to process the key bindings for <code>ks</code> as the result
   * of the <code>KeyEvent</code> <code>e</code>. This obtains
   * the appropriate <code>InputMap</code>,
   * gets the binding, gets the action from the <code>ActionMap</code>,
   * and then (if the action is found and the component
   * is enabled) invokes <code>notifyAction</code> to notify the action.
   *
   * @param ks the <code>KeyStroke</code> queried
   * @param e the <code>KeyEvent</code>
   * @param condition one of the following values: <ul> <li>JComponent.WHEN_FOCUSED
   * <li>JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT <li>JComponent.WHEN_IN_FOCUSED_WINDOW </ul>
   * @param pressed true if the key is pressed
   * @return true if there was a binding to an action, and the action was enabled
   * @since 1.3
   */
  protected boolean processKeyBinding(KeyStroke ks, KeyEvent e,
      int condition, boolean pressed) {
    InputMap map = getInputMap(condition, false);
    ActionMap am = getActionMap(false);

    if (map != null && am != null && isEnabled()) {
      Object binding = map.get(ks);
      Action action = (binding == null) ? null : am.get(binding);
      if (action != null) {
        return SwingUtilities.notifyAction(action, ks, e, this,
            e.getModifiers());
      }
    }
    return false;
  }

  /**
   * This is invoked as the result of a <code>KeyEvent</code>
   * that was not consumed by the <code>FocusManager</code>,
   * <code>KeyListeners</code>, or the component. It will first try
   * <code>WHEN_FOCUSED</code> bindings,
   * then <code>WHEN_ANCESTOR_OF_FOCUSED_COMPONENT</code> bindings,
   * and finally <code>WHEN_IN_FOCUSED_WINDOW</code> bindings.
   *
   * @param e the unconsumed <code>KeyEvent</code>
   * @param pressed true if the key is pressed
   * @return true if there is a key binding for <code>e</code>
   */
  boolean processKeyBindings(KeyEvent e, boolean pressed) {
    if (!SwingUtilities.isValidKeyEventForKeyBindings(e)) {
      return false;
    }
    // Get the KeyStroke
    // There may be two keystrokes associated with a low-level key event;
    // in this case a keystroke made of an extended key code has a priority.
    KeyStroke ks;
    KeyStroke ksE = null;

    if (e.getID() == KeyEvent.KEY_TYPED) {
      ks = KeyStroke.getKeyStroke(e.getKeyChar());
    } else {
      ks = KeyStroke.getKeyStroke(e.getKeyCode(), e.getModifiers(),
          (pressed ? false : true));
      if (e.getKeyCode() != e.getExtendedKeyCode()) {
        ksE = KeyStroke.getKeyStroke(e.getExtendedKeyCode(), e.getModifiers(),
            (pressed ? false : true));
      }
    }

    // Do we have a key binding for e?
    // If we have a binding by an extended code, use it.
    // If not, check for regular code binding.
    if (ksE != null && processKeyBinding(ksE, e, WHEN_FOCUSED, pressed)) {
      return true;
    }
    if (processKeyBinding(ks, e, WHEN_FOCUSED, pressed)) {
      return true;
    }

      /* We have no key binding. Let's try the path from our parent to the
       * window excluded. We store the path components so we can avoid
       * asking the same component twice.
       */
    Container parent = this;
    while (parent != null && !(parent instanceof Window) &&
        !(parent instanceof Applet)) {
      if (parent instanceof JComponent) {
        if (ksE != null && ((JComponent) parent).processKeyBinding(ksE, e,
            WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, pressed)) {
          return true;
        }
        if (((JComponent) parent).processKeyBinding(ks, e,
            WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, pressed)) {
          return true;
        }
      }
      // This is done so that the children of a JInternalFrame are
      // given precedence for WHEN_IN_FOCUSED_WINDOW bindings before
      // other components WHEN_IN_FOCUSED_WINDOW bindings. This also gives
      // more precedence to the WHEN_IN_FOCUSED_WINDOW bindings of the
      // JInternalFrame's children vs the
      // WHEN_ANCESTOR_OF_FOCUSED_COMPONENT bindings of the parents.
      // maybe generalize from JInternalFrame (like isFocusCycleRoot).
      if ((parent instanceof JInternalFrame) &&
          JComponent.processKeyBindingsForAllComponents(e, parent, pressed)) {
        return true;
      }
      parent = parent.getParent();
    }

      /* No components between the focused component and the window is
       * actually interested by the key event. Let's try the other
       * JComponent in this window.
       */
    if (parent != null) {
      return JComponent.processKeyBindingsForAllComponents(e, parent, pressed);
    }
    return false;
  }

  static boolean processKeyBindingsForAllComponents(KeyEvent e,
      Container container, boolean pressed) {
    while (true) {
      if (KeyboardManager.getCurrentManager().fireKeyboardAction(
          e, pressed, container)) {
        return true;
      }
      if (container instanceof Popup.HeavyWeightWindow) {
        container = ((Window) container).getOwner();
      } else {
        return false;
      }
    }
  }

  /**
   * Registers the text to display in a tool tip. The text displays when the cursor lingers over the
   * component. <p> See <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/tooltip.html">How
   * to Use Tool Tips</a> in <em>The Java Tutorial</em> for further documentation.
   *
   * @param text the string to display; if the text is <code>null</code>, the tool tip is turned off
   * for this component
   * @beaninfo preferred: true description: The text to display in a tool tip.
   * @see #TOOL_TIP_TEXT_KEY
   */
  public void setToolTipText(String text) {
    String oldText = getToolTipText();
    putClientProperty(TOOL_TIP_TEXT_KEY, text);
    ToolTipManager toolTipManager = ToolTipManager.sharedInstance();
    if (text != null) {
      if (oldText == null) {
        toolTipManager.registerComponent(this);
      }
    } else {
      toolTipManager.unregisterComponent(this);
    }
  }

  /**
   * Returns the tooltip string that has been set with
   * <code>setToolTipText</code>.
   *
   * @return the text of the tool tip
   * @see #TOOL_TIP_TEXT_KEY
   */
  public String getToolTipText() {
    return (String) getClientProperty(TOOL_TIP_TEXT_KEY);
  }


  /**
   * Returns the string to be used as the tooltip for <i>event</i>.
   * By default this returns any string set using
   * <code>setToolTipText</code>.  If a component provides
   * more extensive API to support differing tooltips at different locations,
   * this method should be overridden.
   */
  public String getToolTipText(MouseEvent event) {
    return getToolTipText();
  }

  /**
   * Returns the tooltip location in this component's coordinate system.
   * If <code>null</code> is returned, Swing will choose a location.
   * The default implementation returns <code>null</code>.
   *
   * @param event the <code>MouseEvent</code> that caused the <code>ToolTipManager</code> to show
   * the tooltip
   * @return always returns <code>null</code>
   */
  public Point getToolTipLocation(MouseEvent event) {
    return null;
  }

  /**
   * Returns the preferred location to display the popup menu in this
   * component's coordinate system. It is up to the look and feel to
   * honor this property, some may choose to ignore it.
   * If {@code null}, the look and feel will choose a suitable location.
   *
   * @param event the {@code MouseEvent} that triggered the popup to be shown, or {@code null} if
   * the popup is not being shown as the result of a mouse event
   * @return location to display the {@code JPopupMenu}, or {@code null}
   * @since 1.5
   */
  public Point getPopupLocation(MouseEvent event) {
    return null;
  }


  /**
   * Returns the instance of <code>JToolTip</code> that should be used
   * to display the tooltip.
   * Components typically would not override this method,
   * but it can be used to
   * cause different tooltips to be displayed differently.
   *
   * @return the <code>JToolTip</code> used to display this toolTip
   */
  public JToolTip createToolTip() {
    JToolTip tip = new JToolTip();
    tip.setComponent(this);
    return tip;
  }

  /**
   * Forwards the <code>scrollRectToVisible()</code> message to the
   * <code>JComponent</code>'s parent. Components that can service
   * the request, such as <code>JViewport</code>,
   * override this method and perform the scrolling.
   *
   * @param aRect the visible <code>Rectangle</code>
   * @see JViewport
   */
  public void scrollRectToVisible(Rectangle aRect) {
    Container parent;
    int dx = getX(), dy = getY();

    for (parent = getParent();
        !(parent == null) &&
            !(parent instanceof JComponent) &&
            !(parent instanceof CellRendererPane);
        parent = parent.getParent()) {
      Rectangle bounds = parent.getBounds();

      dx += bounds.x;
      dy += bounds.y;
    }

    if (!(parent == null) && !(parent instanceof CellRendererPane)) {
      aRect.x += dx;
      aRect.y += dy;

      ((JComponent) parent).scrollRectToVisible(aRect);
      aRect.x -= dx;
      aRect.y -= dy;
    }
  }

  /**
   * Sets the <code>autoscrolls</code> property.
   * If <code>true</code> mouse dragged events will be
   * synthetically generated when the mouse is dragged
   * outside of the component's bounds and mouse motion
   * has paused (while the button continues to be held
   * down). The synthetic events make it appear that the
   * drag gesture has resumed in the direction established when
   * the component's boundary was crossed.  Components that
   * support autoscrolling must handle <code>mouseDragged</code>
   * events by calling <code>scrollRectToVisible</code> with a
   * rectangle that contains the mouse event's location.  All of
   * the Swing components that support item selection and are
   * typically displayed in a <code>JScrollPane</code>
   * (<code>JTable</code>, <code>JList</code>, <code>JTree</code>,
   * <code>JTextArea</code>, and <code>JEditorPane</code>)
   * already handle mouse dragged events in this way.  To enable
   * autoscrolling in any other component, add a mouse motion
   * listener that calls <code>scrollRectToVisible</code>.
   * For example, given a <code>JPanel</code>, <code>myPanel</code>:
   * <pre>
   * MouseMotionListener doScrollRectToVisible = new MouseMotionAdapter() {
   *     public void mouseDragged(MouseEvent e) {
   *        Rectangle r = new Rectangle(e.getX(), e.getY(), 1, 1);
   *        ((JPanel)e.getSource()).scrollRectToVisible(r);
   *    }
   * };
   * myPanel.addMouseMotionListener(doScrollRectToVisible);
   * </pre>
   * The default value of the <code>autoScrolls</code>
   * property is <code>false</code>.
   *
   * @param autoscrolls if true, synthetic mouse dragged events are generated when the mouse is
   * dragged outside of a component's bounds and the mouse button continues to be held down;
   * otherwise false
   * @beaninfo expert: true description: Determines if this component automatically scrolls its
   * contents when dragged.
   * @see #getAutoscrolls
   * @see JViewport
   * @see JScrollPane
   */
  public void setAutoscrolls(boolean autoscrolls) {
    setFlag(AUTOSCROLLS_SET, true);
    if (this.autoscrolls != autoscrolls) {
      this.autoscrolls = autoscrolls;
      if (autoscrolls) {
        enableEvents(AWTEvent.MOUSE_EVENT_MASK);
        enableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
      } else {
        Autoscroller.stop(this);
      }
    }
  }

  /**
   * Gets the <code>autoscrolls</code> property.
   *
   * @return the value of the <code>autoscrolls</code> property
   * @see JViewport
   * @see #setAutoscrolls
   */
  public boolean getAutoscrolls() {
    return autoscrolls;
  }

  /**
   * Sets the {@code TransferHandler}, which provides support for transfer
   * of data into and out of this component via cut/copy/paste and drag
   * and drop. This may be {@code null} if the component does not support
   * data transfer operations.
   * <p>
   * If the new {@code TransferHandler} is not {@code null}, this method
   * also installs a <b>new</b> {@code DropTarget} on the component to
   * activate drop handling through the {@code TransferHandler} and activate
   * any built-in support (such as calculating and displaying potential drop
   * locations). If you do not wish for this component to respond in any way
   * to drops, you can disable drop support entirely either by removing the
   * drop target ({@code setDropTarget(null)}) or by de-activating it
   * ({@code getDropTaget().setActive(false)}).
   * <p>
   * If the new {@code TransferHandler} is {@code null}, this method removes
   * the drop target.
   * <p>
   * Under two circumstances, this method does not modify the drop target:
   * First, if the existing drop target on this component was explicitly
   * set by the developer to a {@code non-null} value. Second, if the
   * system property {@code suppressSwingDropSupport} is {@code true}. The
   * default value for the system property is {@code false}.
   * <p>
   * Please see
   * <a href="https://docs.oracle.com/javase/tutorial/uiswing/dnd/index.html">
   * How to Use Drag and Drop and Data Transfer</a>,
   * a section in <em>The Java Tutorial</em>, for more information.
   *
   * @param newHandler the new {@code TransferHandler}
   * @beaninfo bound: true hidden: true description: Mechanism for transfer of data to and from the
   * component
   * @see TransferHandler
   * @see #getTransferHandler
   * @since 1.4
   */
  public void setTransferHandler(TransferHandler newHandler) {
    TransferHandler oldHandler = (TransferHandler) getClientProperty(
        JComponent_TRANSFER_HANDLER);
    putClientProperty(JComponent_TRANSFER_HANDLER, newHandler);

    SwingUtilities.installSwingDropTargetAsNecessary(this, newHandler);
    firePropertyChange("transferHandler", oldHandler, newHandler);
  }

  /**
   * Gets the <code>transferHandler</code> property.
   *
   * @return the value of the <code>transferHandler</code> property
   * @see TransferHandler
   * @see #setTransferHandler
   * @since 1.4
   */
  public TransferHandler getTransferHandler() {
    return (TransferHandler) getClientProperty(JComponent_TRANSFER_HANDLER);
  }

  /**
   * Calculates a custom drop location for this type of component,
   * representing where a drop at the given point should insert data.
   * <code>null</code> is returned if this component doesn't calculate
   * custom drop locations. In this case, <code>TransferHandler</code>
   * will provide a default <code>DropLocation</code> containing just
   * the point.
   *
   * @param p the point to calculate a drop location for
   * @return the drop location, or <code>null</code>
   */
  TransferHandler.DropLocation dropLocationForPoint(Point p) {
    return null;
  }

  /**
   * Called to set or clear the drop location during a DnD operation.
   * In some cases, the component may need to use its internal selection
   * temporarily to indicate the drop location. To help facilitate this,
   * this method returns and accepts as a parameter a state object.
   * This state object can be used to store, and later restore, the selection
   * state. Whatever this method returns will be passed back to it in
   * future calls, as the state parameter. If it wants the DnD system to
   * continue storing the same state, it must pass it back every time.
   * Here's how this is used:
   * <p>
   * Let's say that on the first call to this method the component decides
   * to save some state (because it is about to use the selection to show
   * a drop index). It can return a state object to the caller encapsulating
   * any saved selection state. On a second call, let's say the drop location
   * is being changed to something else. The component doesn't need to
   * restore anything yet, so it simply passes back the same state object
   * to have the DnD system continue storing it. Finally, let's say this
   * method is messaged with <code>null</code>. This means DnD
   * is finished with this component for now, meaning it should restore
   * state. At this point, it can use the state parameter to restore
   * said state, and of course return <code>null</code> since there's
   * no longer anything to store.
   *
   * @param location the drop location (as calculated by <code>dropLocationForPoint</code>) or
   * <code>null</code> if there's no longer a valid drop location
   * @param state the state object saved earlier for this component, or <code>null</code>
   * @param forDrop whether or not the method is being called because an actual drop occurred
   * @return any saved state for this component, or <code>null</code> if none
   */
  Object setDropLocation(TransferHandler.DropLocation location,
      Object state,
      boolean forDrop) {

    return null;
  }

  /**
   * Called to indicate to this component that DnD is done.
   * Needed by <code>JTree</code>.
   */
  void dndDone() {
  }

  /**
   * Processes mouse events occurring on this component by
   * dispatching them to any registered
   * <code>MouseListener</code> objects, refer to
   * {@link java.awt.Component#processMouseEvent(MouseEvent)}
   * for a complete description of this method.
   *
   * @param e the mouse event
   * @see java.awt.Component#processMouseEvent
   * @since 1.5
   */
  protected void processMouseEvent(MouseEvent e) {
    if (autoscrolls && e.getID() == MouseEvent.MOUSE_RELEASED) {
      Autoscroller.stop(this);
    }
    super.processMouseEvent(e);
  }

  /**
   * Processes mouse motion events, such as MouseEvent.MOUSE_DRAGGED.
   *
   * @param e the <code>MouseEvent</code>
   * @see MouseEvent
   */
  protected void processMouseMotionEvent(MouseEvent e) {
    boolean dispatch = true;
    if (autoscrolls && e.getID() == MouseEvent.MOUSE_DRAGGED) {
      // We don't want to do the drags when the mouse moves if we're
      // autoscrolling.  It makes it feel spastic.
      dispatch = !Autoscroller.isRunning(this);
      Autoscroller.processMouseDragged(e);
    }
    if (dispatch) {
      super.processMouseMotionEvent(e);
    }
  }

  // Inner classes can't get at this method from a super class
  void superProcessMouseMotionEvent(MouseEvent e) {
    super.processMouseMotionEvent(e);
  }

  /**
   * This is invoked by the <code>RepaintManager</code> if
   * <code>createImage</code> is called on the component.
   *
   * @param newValue true if the double buffer image was created from this component
   */
  void setCreatedDoubleBuffer(boolean newValue) {
    setFlag(CREATED_DOUBLE_BUFFER, newValue);
  }

  /**
   * Returns true if the <code>RepaintManager</code>
   * created the double buffer image from the component.
   *
   * @return true if this component had a double buffer image, false otherwise
   */
  boolean getCreatedDoubleBuffer() {
    return getFlag(CREATED_DOUBLE_BUFFER);
  }

  /**
   * <code>ActionStandin</code> is used as a standin for
   * <code>ActionListeners</code> that are
   * added via <code>registerKeyboardAction</code>.
   */
  final class ActionStandin implements Action {

    private final ActionListener actionListener;
    private final String command;
    // This will be non-null if actionListener is an Action.
    private final Action action;

    ActionStandin(ActionListener actionListener, String command) {
      this.actionListener = actionListener;
      if (actionListener instanceof Action) {
        this.action = (Action) actionListener;
      } else {
        this.action = null;
      }
      this.command = command;
    }

    public Object getValue(String key) {
      if (key != null) {
        if (key.equals(Action.ACTION_COMMAND_KEY)) {
          return command;
        }
        if (action != null) {
          return action.getValue(key);
        }
        if (key.equals(NAME)) {
          return "ActionStandin";
        }
      }
      return null;
    }

    public boolean isEnabled() {
      if (actionListener == null) {
        // This keeps the old semantics where
        // registerKeyboardAction(null) would essentialy remove
        // the binding. We don't remove the binding from the
        // InputMap as that would still allow parent InputMaps
        // bindings to be accessed.
        return false;
      }
      if (action == null) {
        return true;
      }
      return action.isEnabled();
    }

    public void actionPerformed(ActionEvent ae) {
      if (actionListener != null) {
        actionListener.actionPerformed(ae);
      }
    }

    // We don't allow any values to be added.
    public void putValue(String key, Object value) {
    }

    // Does nothing, our enabledness is determiend from our asociated
    // action.
    public void setEnabled(boolean b) {
    }

    public void addPropertyChangeListener
        (PropertyChangeListener listener) {
    }

    public void removePropertyChangeListener
        (PropertyChangeListener listener) {
    }
  }


  // This class is used by the KeyboardState class to provide a single
  // instance that can be stored in the AppContext.
  static final class IntVector {

    int array[] = null;
    int count = 0;
    int capacity = 0;

    int size() {
      return count;
    }

    int elementAt(int index) {
      return array[index];
    }

    void addElement(int value) {
      if (count == capacity) {
        capacity = (capacity + 2) * 2;
        int[] newarray = new int[capacity];
        if (count > 0) {
          System.arraycopy(array, 0, newarray, 0, count);
        }
        array = newarray;
      }
      array[count++] = value;
    }

    void setElementAt(int value, int index) {
      array[index] = value;
    }
  }

  @SuppressWarnings("serial")
  static class KeyboardState implements Serializable {

    private static final Object keyCodesKey =
        JComponent.KeyboardState.class;

    // Get the array of key codes from the AppContext.
    static IntVector getKeyCodeArray() {
      IntVector iv =
          (IntVector) SwingUtilities.appContextGet(keyCodesKey);
      if (iv == null) {
        iv = new IntVector();
        SwingUtilities.appContextPut(keyCodesKey, iv);
      }
      return iv;
    }

    static void registerKeyPressed(int keyCode) {
      IntVector kca = getKeyCodeArray();
      int count = kca.size();
      int i;
      for (i = 0; i < count; i++) {
        if (kca.elementAt(i) == -1) {
          kca.setElementAt(keyCode, i);
          return;
        }
      }
      kca.addElement(keyCode);
    }

    static void registerKeyReleased(int keyCode) {
      IntVector kca = getKeyCodeArray();
      int count = kca.size();
      int i;
      for (i = 0; i < count; i++) {
        if (kca.elementAt(i) == keyCode) {
          kca.setElementAt(-1, i);
          return;
        }
      }
    }

    static boolean keyIsPressed(int keyCode) {
      IntVector kca = getKeyCodeArray();
      int count = kca.size();
      int i;
      for (i = 0; i < count; i++) {
        if (kca.elementAt(i) == keyCode) {
          return true;
        }
      }
      return false;
    }

    /**
     * Updates internal state of the KeyboardState and returns true
     * if the event should be processed further.
     */
    static boolean shouldProcess(KeyEvent e) {
      switch (e.getID()) {
        case KeyEvent.KEY_PRESSED:
          if (!keyIsPressed(e.getKeyCode())) {
            registerKeyPressed(e.getKeyCode());
          }
          return true;
        case KeyEvent.KEY_RELEASED:
          // We are forced to process VK_PRINTSCREEN separately because
          // the Windows doesn't generate the key pressed event for
          // printscreen and it block the processing of key release
          // event for printscreen.
          if (keyIsPressed(e.getKeyCode()) || e.getKeyCode() == KeyEvent.VK_PRINTSCREEN) {
            registerKeyReleased(e.getKeyCode());
            return true;
          }
          return false;
        case KeyEvent.KEY_TYPED:
          return true;
        default:
          // Not a known KeyEvent type, bail.
          return false;
      }
    }
  }

  static final sun.awt.RequestFocusController focusController =
      new sun.awt.RequestFocusController() {
        public boolean acceptRequestFocus(Component from, Component to,
            boolean temporary, boolean focusedWindowChangeAllowed,
            sun.awt.CausedFocusEvent.Cause cause) {
          if ((to == null) || !(to instanceof JComponent)) {
            return true;
          }

          if ((from == null) || !(from instanceof JComponent)) {
            return true;
          }

          JComponent target = (JComponent) to;
          if (!target.getVerifyInputWhenFocusTarget()) {
            return true;
          }

          JComponent jFocusOwner = (JComponent) from;
          InputVerifier iv = jFocusOwner.getInputVerifier();

          if (iv == null) {
            return true;
          } else {
            Object currentSource = SwingUtilities.appContextGet(
                INPUT_VERIFIER_SOURCE_KEY);
            if (currentSource == jFocusOwner) {
              // We're currently calling into the InputVerifier
              // for this component, so allow the focus change.
              return true;
            }
            SwingUtilities.appContextPut(INPUT_VERIFIER_SOURCE_KEY,
                jFocusOwner);
            try {
              return iv.shouldYieldFocus(jFocusOwner);
            } finally {
              if (currentSource != null) {
                // We're already in the InputVerifier for
                // currentSource. By resetting the currentSource
                // we ensure that if the InputVerifier for
                // currentSource does a requestFocus, we don't
                // try and run the InputVerifier again.
                SwingUtilities.appContextPut(
                    INPUT_VERIFIER_SOURCE_KEY, currentSource);
              } else {
                SwingUtilities.appContextRemove(
                    INPUT_VERIFIER_SOURCE_KEY);
              }
            }
          }
        }
      };

    /*
     * --- Accessibility Support ---
     */

  /**
   * @deprecated As of JDK version 1.1, replaced by <code>java.awt.Component.setEnabled(boolean)</code>.
   */
  @Deprecated
  public void enable() {
    if (isEnabled() != true) {
      super.enable();
      if (accessibleContext != null) {
        accessibleContext.firePropertyChange(
            AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
            null, AccessibleState.ENABLED);
      }
    }
  }

  /**
   * @deprecated As of JDK version 1.1, replaced by <code>java.awt.Component.setEnabled(boolean)</code>.
   */
  @Deprecated
  public void disable() {
    if (isEnabled() != false) {
      super.disable();
      if (accessibleContext != null) {
        accessibleContext.firePropertyChange(
            AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
            AccessibleState.ENABLED, null);
      }
    }
  }

  /**
   * Inner class of JComponent used to provide default support for
   * accessibility.  This class is not meant to be used directly by
   * application developers, but is instead meant only to be
   * subclassed by component developers.
   * <p>
   * <strong>Warning:</strong>
   * Serialized objects of this class will not be compatible with
   * future Swing releases. The current serialization support is
   * appropriate for short term storage or RMI between applications running
   * the same version of Swing.  As of 1.4, support for long term storage
   * of all JavaBeans&trade;
   * has been added to the <code>java.beans</code> package.
   * Please see {@link java.beans.XMLEncoder}.
   */
  public abstract class AccessibleJComponent extends AccessibleAWTContainer
      implements AccessibleExtendedComponent {

    /**
     * Though the class is abstract, this should be called by
     * all sub-classes.
     */
    protected AccessibleJComponent() {
      super();
    }

    /**
     * Number of PropertyChangeListener objects registered. It's used
     * to add/remove ContainerListener and FocusListener to track
     * target JComponent's state
     */
    private volatile transient int propertyListenersCount = 0;

    /**
     * This field duplicates the function of the accessibleAWTFocusHandler field
     * in java.awt.Component.AccessibleAWTComponent, so it has been deprecated.
     */
    @Deprecated
    protected FocusListener accessibleFocusHandler = null;

    /**
     * Fire PropertyChange listener, if one is registered,
     * when children added/removed.
     */
    protected class AccessibleContainerHandler
        implements ContainerListener {

      public void componentAdded(ContainerEvent e) {
        Component c = e.getChild();
        if (c != null && c instanceof Accessible) {
          AccessibleJComponent.this.firePropertyChange(
              AccessibleContext.ACCESSIBLE_CHILD_PROPERTY,
              null, c.getAccessibleContext());
        }
      }

      public void componentRemoved(ContainerEvent e) {
        Component c = e.getChild();
        if (c != null && c instanceof Accessible) {
          AccessibleJComponent.this.firePropertyChange(
              AccessibleContext.ACCESSIBLE_CHILD_PROPERTY,
              c.getAccessibleContext(), null);
        }
      }
    }

    /**
     * Fire PropertyChange listener, if one is registered,
     * when focus events happen
     *
     * @since 1.3
     */
    protected class AccessibleFocusHandler implements FocusListener {

      public void focusGained(FocusEvent event) {
        if (accessibleContext != null) {
          accessibleContext.firePropertyChange(
              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
              null, AccessibleState.FOCUSED);
        }
      }

      public void focusLost(FocusEvent event) {
        if (accessibleContext != null) {
          accessibleContext.firePropertyChange(
              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
              AccessibleState.FOCUSED, null);
        }
      }
    } // inner class AccessibleFocusHandler


    /**
     * Adds a PropertyChangeListener to the listener list.
     *
     * @param listener the PropertyChangeListener to be added
     */
    public void addPropertyChangeListener(PropertyChangeListener listener) {
      super.addPropertyChangeListener(listener);
    }

    /**
     * Removes a PropertyChangeListener from the listener list.
     * This removes a PropertyChangeListener that was registered
     * for all properties.
     *
     * @param listener the PropertyChangeListener to be removed
     */
    public void removePropertyChangeListener(PropertyChangeListener listener) {
      super.removePropertyChangeListener(listener);
    }


    /**
     * Recursively search through the border hierarchy (if it exists)
     * for a TitledBorder with a non-null title.  This does a depth
     * first search on first the inside borders then the outside borders.
     * The assumption is that titles make really pretty inside borders
     * but not very pretty outside borders in compound border situations.
     * It's rather arbitrary, but hopefully decent UI programmers will
     * not create multiple titled borders for the same component.
     */
    protected String getBorderTitle(Border b) {
      String s;
      if (b instanceof TitledBorder) {
        return ((TitledBorder) b).getTitle();
      } else if (b instanceof CompoundBorder) {
        s = getBorderTitle(((CompoundBorder) b).getInsideBorder());
        if (s == null) {
          s = getBorderTitle(((CompoundBorder) b).getOutsideBorder());
        }
        return s;
      } else {
        return null;
      }
    }

    // AccessibleContext methods
    //

    /**
     * Gets the accessible name of this object.  This should almost never
     * return java.awt.Component.getName(), as that generally isn't
     * a localized name, and doesn't have meaning for the user.  If the
     * object is fundamentally a text object (such as a menu item), the
     * accessible name should be the text of the object (for example,
     * "save").
     * If the object has a tooltip, the tooltip text may also be an
     * appropriate String to return.
     *
     * @return the localized name of the object -- can be null if this object does not have a name
     * @see AccessibleContext#setAccessibleName
     */
    public String getAccessibleName() {
      String name = accessibleName;

      // fallback to the client name property
      //
      if (name == null) {
        name = (String) getClientProperty(AccessibleContext.ACCESSIBLE_NAME_PROPERTY);
      }

      // fallback to the titled border if it exists
      //
      if (name == null) {
        name = getBorderTitle(getBorder());
      }

      // fallback to the label labeling us if it exists
      //
      if (name == null) {
        Object o = getClientProperty(JLabel.LABELED_BY_PROPERTY);
        if (o instanceof Accessible) {
          AccessibleContext ac = ((Accessible) o).getAccessibleContext();
          if (ac != null) {
            name = ac.getAccessibleName();
          }
        }
      }
      return name;
    }

    /**
     * Gets the accessible description of this object.  This should be
     * a concise, localized description of what this object is - what
     * is its meaning to the user.  If the object has a tooltip, the
     * tooltip text may be an appropriate string to return, assuming
     * it contains a concise description of the object (instead of just
     * the name of the object - for example a "Save" icon on a toolbar that
     * had "save" as the tooltip text shouldn't return the tooltip
     * text as the description, but something like "Saves the current
     * text document" instead).
     *
     * @return the localized description of the object -- can be null if this object does not have a
     * description
     * @see AccessibleContext#setAccessibleDescription
     */
    public String getAccessibleDescription() {
      String description = accessibleDescription;

      // fallback to the client description property
      //
      if (description == null) {
        description = (String) getClientProperty(AccessibleContext.ACCESSIBLE_DESCRIPTION_PROPERTY);
      }

      // fallback to the tool tip text if it exists
      //
      if (description == null) {
        try {
          description = getToolTipText();
        } catch (Exception e) {
          // Just in case the subclass overrode the
          // getToolTipText method and actually
          // requires a MouseEvent.
          // [[[FIXME:  WDW - we probably should require this
          // method to take a MouseEvent and just pass it on
          // to getToolTipText.  The swing-feedback traffic
          // leads me to believe getToolTipText might change,
          // though, so I was hesitant to make this change at
          // this time.]]]
        }
      }

      // fallback to the label labeling us if it exists
      //
      if (description == null) {
        Object o = getClientProperty(JLabel.LABELED_BY_PROPERTY);
        if (o instanceof Accessible) {
          AccessibleContext ac = ((Accessible) o).getAccessibleContext();
          if (ac != null) {
            description = ac.getAccessibleDescription();
          }
        }
      }

      return description;
    }

    /**
     * Gets the role of this object.
     *
     * @return an instance of AccessibleRole describing the role of the object
     * @see AccessibleRole
     */
    public AccessibleRole getAccessibleRole() {
      return AccessibleRole.SWING_COMPONENT;
    }

    /**
     * Gets the state of this object.
     *
     * @return an instance of AccessibleStateSet containing the current state set of the object
     * @see AccessibleState
     */
    public AccessibleStateSet getAccessibleStateSet() {
      AccessibleStateSet states = super.getAccessibleStateSet();
      if (JComponent.this.isOpaque()) {
        states.add(AccessibleState.OPAQUE);
      }
      return states;
    }

    /**
     * Returns the number of accessible children in the object.  If all
     * of the children of this object implement Accessible, than this
     * method should return the number of children of this object.
     *
     * @return the number of accessible children in the object.
     */
    public int getAccessibleChildrenCount() {
      return super.getAccessibleChildrenCount();
    }

    /**
     * Returns the nth Accessible child of the object.
     *
     * @param i zero-based index of child
     * @return the nth Accessible child of the object
     */
    public Accessible getAccessibleChild(int i) {
      return super.getAccessibleChild(i);
    }

    // ----- AccessibleExtendedComponent

    /**
     * Returns the AccessibleExtendedComponent
     *
     * @return the AccessibleExtendedComponent
     */
    AccessibleExtendedComponent getAccessibleExtendedComponent() {
      return this;
    }

    /**
     * Returns the tool tip text
     *
     * @return the tool tip text, if supported, of the object; otherwise, null
     * @since 1.4
     */
    public String getToolTipText() {
      return JComponent.this.getToolTipText();
    }

    /**
     * Returns the titled border text
     *
     * @return the titled border text, if supported, of the object; otherwise, null
     * @since 1.4
     */
    public String getTitledBorderText() {
      Border border = JComponent.this.getBorder();
      if (border instanceof TitledBorder) {
        return ((TitledBorder) border).getTitle();
      } else {
        return null;
      }
    }

    /**
     * Returns key bindings associated with this object
     *
     * @return the key bindings, if supported, of the object; otherwise, null
     * @see AccessibleKeyBinding
     * @since 1.4
     */
    public AccessibleKeyBinding getAccessibleKeyBinding() {
      // Try to get the linked label's mnemonic if it exists
      Object o = getClientProperty(JLabel.LABELED_BY_PROPERTY);
      if (o instanceof Accessible) {
        AccessibleContext ac = ((Accessible) o).getAccessibleContext();
        if (ac != null) {
          AccessibleComponent comp = ac.getAccessibleComponent();
          if (!(comp instanceof AccessibleExtendedComponent)) {
            return null;
          }
          return ((AccessibleExtendedComponent) comp).getAccessibleKeyBinding();
        }
      }
      return null;
    }
  } // inner class AccessibleJComponent


  /**
   * Returns an <code>ArrayTable</code> used for
   * key/value "client properties" for this component. If the
   * <code>clientProperties</code> table doesn't exist, an empty one
   * will be created.
   *
   * @return an ArrayTable
   * @see #putClientProperty
   * @see #getClientProperty
   */
  private ArrayTable getClientProperties() {
    if (clientProperties == null) {
      clientProperties = new ArrayTable();
    }
    return clientProperties;
  }


  /**
   * Returns the value of the property with the specified key.  Only
   * properties added with <code>putClientProperty</code> will return
   * a non-<code>null</code> value.
   *
   * @param key the being queried
   * @return the value of this property or <code>null</code>
   * @see #putClientProperty
   */
  public final Object getClientProperty(Object key) {
    if (key == SwingUtilities2.AA_TEXT_PROPERTY_KEY) {
      return aaTextInfo;
    } else if (key == SwingUtilities2.COMPONENT_UI_PROPERTY_KEY) {
      return ui;
    }
    if (clientProperties == null) {
      return null;
    } else {
      synchronized (clientProperties) {
        return clientProperties.get(key);
      }
    }
  }

  /**
   * Adds an arbitrary key/value "client property" to this component.
   * <p>
   * The <code>get/putClientProperty</code> methods provide access to
   * a small per-instance hashtable. Callers can use get/putClientProperty
   * to annotate components that were created by another module.
   * For example, a
   * layout manager might store per child constraints this way. For example:
   * <pre>
   * componentA.putClientProperty("to the left of", componentB);
   * </pre>
   * If value is <code>null</code> this method will remove the property.
   * Changes to client properties are reported with
   * <code>PropertyChange</code> events.
   * The name of the property (for the sake of PropertyChange
   * events) is <code>key.toString()</code>.
   * <p>
   * The <code>clientProperty</code> dictionary is not intended to
   * support large
   * scale extensions to JComponent nor should be it considered an
   * alternative to subclassing when designing a new component.
   *
   * @param key the new client property key
   * @param value the new client property value; if <code>null</code> this method will remove the
   * property
   * @see #getClientProperty
   * @see #addPropertyChangeListener
   */
  public final void putClientProperty(Object key, Object value) {
    if (key == SwingUtilities2.AA_TEXT_PROPERTY_KEY) {
      aaTextInfo = value;
      return;
    }
    if (value == null && clientProperties == null) {
      // Both the value and ArrayTable are null, implying we don't
      // have to do anything.
      return;
    }
    ArrayTable clientProperties = getClientProperties();
    Object oldValue;
    synchronized (clientProperties) {
      oldValue = clientProperties.get(key);
      if (value != null) {
        clientProperties.put(key, value);
      } else if (oldValue != null) {
        clientProperties.remove(key);
      } else {
        // old == new == null
        return;
      }
    }
    clientPropertyChanged(key, oldValue, value);
    firePropertyChange(key.toString(), oldValue, value);
  }

  // Invoked from putClientProperty.  This is provided for subclasses
  // in Swing.
  void clientPropertyChanged(Object key, Object oldValue,
      Object newValue) {
  }


  /*
     * Sets the property with the specified name to the specified value if
     * the property has not already been set by the client program.
     * This method is used primarily to set UI defaults for properties
     * with primitive types, where the values cannot be marked with
     * UIResource.
     * @see LookAndFeel#installProperty
     * @param propertyName String containing the name of the property
     * @param value Object containing the property value
     */
  void setUIProperty(String propertyName, Object value) {
    if (propertyName == "opaque") {
      if (!getFlag(OPAQUE_SET)) {
        setOpaque(((Boolean) value).booleanValue());
        setFlag(OPAQUE_SET, false);
      }
    } else if (propertyName == "autoscrolls") {
      if (!getFlag(AUTOSCROLLS_SET)) {
        setAutoscrolls(((Boolean) value).booleanValue());
        setFlag(AUTOSCROLLS_SET, false);
      }
    } else if (propertyName == "focusTraversalKeysForward") {
      if (!getFlag(FOCUS_TRAVERSAL_KEYS_FORWARD_SET)) {
        super.setFocusTraversalKeys(KeyboardFocusManager.
                FORWARD_TRAVERSAL_KEYS,
            (Set<AWTKeyStroke>) value);
      }
    } else if (propertyName == "focusTraversalKeysBackward") {
      if (!getFlag(FOCUS_TRAVERSAL_KEYS_BACKWARD_SET)) {
        super.setFocusTraversalKeys(KeyboardFocusManager.
                BACKWARD_TRAVERSAL_KEYS,
            (Set<AWTKeyStroke>) value);
      }
    } else {
      throw new IllegalArgumentException("property \"" +
          propertyName + "\" cannot be set using this method");
    }
  }


  /**
   * Sets the focus traversal keys for a given traversal operation for this
   * Component.
   * Refer to
   * {@link java.awt.Component#setFocusTraversalKeys}
   * for a complete description of this method.
   * <p>
   * This method may throw a {@code ClassCastException} if any {@code Object}
   * in {@code keystrokes} is not an {@code AWTKeyStroke}.
   *
   * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS,
   * or KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
   * @param keystrokes the Set of AWTKeyStroke for the specified operation
   * @throws IllegalArgumentException if id is not one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
   * KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS,
   * or if keystrokes contains null, or if any keystroke represents a KEY_TYPED event, or if any
   * keystroke already maps to another focus traversal operation for this Component
   * @beaninfo bound: true
   * @see java.awt.KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
   * @see java.awt.KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
   * @see java.awt.KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
   * @since 1.5
   */
  public void
  setFocusTraversalKeys(int id, Set<? extends AWTKeyStroke> keystrokes) {
    if (id == KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS) {
      setFlag(FOCUS_TRAVERSAL_KEYS_FORWARD_SET, true);
    } else if (id == KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS) {
      setFlag(FOCUS_TRAVERSAL_KEYS_BACKWARD_SET, true);
    }
    super.setFocusTraversalKeys(id, keystrokes);
  }

    /* --- Transitional java.awt.Component Support ---
     * The methods and fields in this section will migrate to
     * java.awt.Component in the next JDK release.
     */

  /**
   * Returns true if this component is lightweight, that is, if it doesn't
   * have a native window system peer.
   *
   * @return true if this component is lightweight
   */
  @SuppressWarnings("deprecation")
  public static boolean isLightweightComponent(Component c) {
    return c.getPeer() instanceof LightweightPeer;
  }


  /**
   * @param x the new horizontal location
   * @param y the new vertical location
   * @param w the new width
   * @param h the new height
   * @see java.awt.Component#setBounds
   * @deprecated As of JDK 5, replaced by <code>Component.setBounds(int, int, int, int)</code>. <p>
   * Moves and resizes this component.
   */
  @Deprecated
  public void reshape(int x, int y, int w, int h) {
    super.reshape(x, y, w, h);
  }


  /**
   * Stores the bounds of this component into "return value"
   * <code>rv</code> and returns <code>rv</code>.
   * If <code>rv</code> is <code>null</code> a new <code>Rectangle</code>
   * is allocated.  This version of <code>getBounds</code> is useful
   * if the caller wants to avoid allocating a new <code>Rectangle</code>
   * object on the heap.
   *
   * @param rv the return value, modified to the component's bounds
   * @return <code>rv</code>; if <code>rv</code> is <code>null</code> return a newly created
   * <code>Rectangle</code> with this component's bounds
   */
  public Rectangle getBounds(Rectangle rv) {
    if (rv == null) {
      return new Rectangle(getX(), getY(), getWidth(), getHeight());
    } else {
      rv.setBounds(getX(), getY(), getWidth(), getHeight());
      return rv;
    }
  }


  /**
   * Stores the width/height of this component into "return value"
   * <code>rv</code> and returns <code>rv</code>.
   * If <code>rv</code> is <code>null</code> a new <code>Dimension</code>
   * object is allocated.  This version of <code>getSize</code>
   * is useful if the caller wants to avoid allocating a new
   * <code>Dimension</code> object on the heap.
   *
   * @param rv the return value, modified to the component's size
   * @return <code>rv</code>
   */
  public Dimension getSize(Dimension rv) {
    if (rv == null) {
      return new Dimension(getWidth(), getHeight());
    } else {
      rv.setSize(getWidth(), getHeight());
      return rv;
    }
  }


  /**
   * Stores the x,y origin of this component into "return value"
   * <code>rv</code> and returns <code>rv</code>.
   * If <code>rv</code> is <code>null</code> a new <code>Point</code>
   * is allocated.  This version of <code>getLocation</code> is useful
   * if the caller wants to avoid allocating a new <code>Point</code>
   * object on the heap.
   *
   * @param rv the return value, modified to the component's location
   * @return <code>rv</code>
   */
  public Point getLocation(Point rv) {
    if (rv == null) {
      return new Point(getX(), getY());
    } else {
      rv.setLocation(getX(), getY());
      return rv;
    }
  }


  /**
   * Returns the current x coordinate of the component's origin.
   * This method is preferable to writing
   * <code>component.getBounds().x</code>, or
   * <code>component.getLocation().x</code> because it doesn't cause any
   * heap allocations.
   *
   * @return the current x coordinate of the component's origin
   */
  public int getX() {
    return super.getX();
  }


  /**
   * Returns the current y coordinate of the component's origin.
   * This method is preferable to writing
   * <code>component.getBounds().y</code>, or
   * <code>component.getLocation().y</code> because it doesn't cause any
   * heap allocations.
   *
   * @return the current y coordinate of the component's origin
   */
  public int getY() {
    return super.getY();
  }


  /**
   * Returns the current width of this component.
   * This method is preferable to writing
   * <code>component.getBounds().width</code>, or
   * <code>component.getSize().width</code> because it doesn't cause any
   * heap allocations.
   *
   * @return the current width of this component
   */
  public int getWidth() {
    return super.getWidth();
  }


  /**
   * Returns the current height of this component.
   * This method is preferable to writing
   * <code>component.getBounds().height</code>, or
   * <code>component.getSize().height</code> because it doesn't cause any
   * heap allocations.
   *
   * @return the current height of this component
   */
  public int getHeight() {
    return super.getHeight();
  }

  /**
   * Returns true if this component is completely opaque.
   * <p>
   * An opaque component paints every pixel within its
   * rectangular bounds. A non-opaque component paints only a subset of
   * its pixels or none at all, allowing the pixels underneath it to
   * "show through".  Therefore, a component that does not fully paint
   * its pixels provides a degree of transparency.
   * <p>
   * Subclasses that guarantee to always completely paint their contents
   * should override this method and return true.
   *
   * @return true if this component is completely opaque
   * @see #setOpaque
   */
  public boolean isOpaque() {
    return getFlag(IS_OPAQUE);
  }

  /**
   * If true the component paints every pixel within its bounds.
   * Otherwise, the component may not paint some or all of its
   * pixels, allowing the underlying pixels to show through.
   * <p>
   * The default value of this property is false for <code>JComponent</code>.
   * However, the default value for this property on most standard
   * <code>JComponent</code> subclasses (such as <code>JButton</code> and
   * <code>JTree</code>) is look-and-feel dependent.
   *
   * @param isOpaque true if this component should be opaque
   * @beaninfo bound: true expert: true description: The component's opacity
   * @see #isOpaque
   */
  public void setOpaque(boolean isOpaque) {
    boolean oldValue = getFlag(IS_OPAQUE);
    setFlag(IS_OPAQUE, isOpaque);
    setFlag(OPAQUE_SET, true);
    firePropertyChange("opaque", oldValue, isOpaque);
  }


  /**
   * If the specified rectangle is completely obscured by any of this
   * component's opaque children then returns true.  Only direct children
   * are considered, more distant descendants are ignored.  A
   * <code>JComponent</code> is opaque if
   * <code>JComponent.isOpaque()</code> returns true, other lightweight
   * components are always considered transparent, and heavyweight components
   * are always considered opaque.
   *
   * @param x x value of specified rectangle
   * @param y y value of specified rectangle
   * @param width width of specified rectangle
   * @param height height of specified rectangle
   * @return true if the specified rectangle is obscured by an opaque child
   */
  boolean rectangleIsObscured(int x, int y, int width, int height) {
    int numChildren = getComponentCount();

    for (int i = 0; i < numChildren; i++) {
      Component child = getComponent(i);
      int cx, cy, cw, ch;

      cx = child.getX();
      cy = child.getY();
      cw = child.getWidth();
      ch = child.getHeight();

      if (x >= cx && (x + width) <= (cx + cw) &&
          y >= cy && (y + height) <= (cy + ch) && child.isVisible()) {

        if (child instanceof JComponent) {
//                  System.out.println("A) checking opaque: " + ((JComponent)child).isOpaque() + "  " + child);
//                  System.out.print("B) ");
//                  Thread.dumpStack();
          return child.isOpaque();
        } else {
          /** Sometimes a heavy weight can have a bound larger than its peer size
           *  so we should always draw under heavy weights
           */
          return false;
        }
      }
    }

    return false;
  }


  /**
   * Returns the <code>Component</code>'s "visible rect rectangle" -  the
   * intersection of the visible rectangles for the component <code>c</code>
   * and all of its ancestors.  The return value is stored in
   * <code>visibleRect</code>.
   *
   * @param c the component
   * @param visibleRect a <code>Rectangle</code> computed as the intersection of all visible
   * rectangles for the component <code>c</code> and all of its ancestors -- this is the return
   * value for this method
   * @see #getVisibleRect
   */
  static final void computeVisibleRect(Component c, Rectangle visibleRect) {
    Container p = c.getParent();
    Rectangle bounds = c.getBounds();

    if (p == null || p instanceof Window || p instanceof Applet) {
      visibleRect.setBounds(0, 0, bounds.width, bounds.height);
    } else {
      computeVisibleRect(p, visibleRect);
      visibleRect.x -= bounds.x;
      visibleRect.y -= bounds.y;
      SwingUtilities.computeIntersection(0, 0, bounds.width, bounds.height, visibleRect);
    }
  }


  /**
   * Returns the <code>Component</code>'s "visible rect rectangle" -  the
   * intersection of the visible rectangles for this component
   * and all of its ancestors.  The return value is stored in
   * <code>visibleRect</code>.
   *
   * @param visibleRect a <code>Rectangle</code> computed as the intersection of all visible
   * rectangles for this component and all of its ancestors -- this is the return value for this
   * method
   * @see #getVisibleRect
   */
  public void computeVisibleRect(Rectangle visibleRect) {
    computeVisibleRect(this, visibleRect);
  }


  /**
   * Returns the <code>Component</code>'s "visible rectangle" -  the
   * intersection of this component's visible rectangle,
   * <code>new Rectangle(0, 0, getWidth(), getHeight())</code>,
   * and all of its ancestors' visible rectangles.
   *
   * @return the visible rectangle
   */
  public Rectangle getVisibleRect() {
    Rectangle visibleRect = new Rectangle();

    computeVisibleRect(visibleRect);
    return visibleRect;
  }

  /**
   * Support for reporting bound property changes for boolean properties.
   * This method can be called when a bound property has changed and it will
   * send the appropriate PropertyChangeEvent to any registered
   * PropertyChangeListeners.
   *
   * @param propertyName the property whose value has changed
   * @param oldValue the property's previous value
   * @param newValue the property's new value
   */
  public void firePropertyChange(String propertyName,
      boolean oldValue, boolean newValue) {
    super.firePropertyChange(propertyName, oldValue, newValue);
  }


  /**
   * Support for reporting bound property changes for integer properties.
   * This method can be called when a bound property has changed and it will
   * send the appropriate PropertyChangeEvent to any registered
   * PropertyChangeListeners.
   *
   * @param propertyName the property whose value has changed
   * @param oldValue the property's previous value
   * @param newValue the property's new value
   */
  public void firePropertyChange(String propertyName,
      int oldValue, int newValue) {
    super.firePropertyChange(propertyName, oldValue, newValue);
  }

  // XXX This method is implemented as a workaround to a JLS issue with ambiguous
  // methods. This should be removed once 4758654 is resolved.
  public void firePropertyChange(String propertyName, char oldValue, char newValue) {
    super.firePropertyChange(propertyName, oldValue, newValue);
  }

  /**
   * Supports reporting constrained property changes.
   * This method can be called when a constrained property has changed
   * and it will send the appropriate <code>PropertyChangeEvent</code>
   * to any registered <code>VetoableChangeListeners</code>.
   *
   * @param propertyName the name of the property that was listened on
   * @param oldValue the old value of the property
   * @param newValue the new value of the property
   * @throws java.beans.PropertyVetoException when the attempt to set the property is vetoed by the
   * component
   */
  protected void fireVetoableChange(String propertyName, Object oldValue, Object newValue)
      throws java.beans.PropertyVetoException {
    if (vetoableChangeSupport == null) {
      return;
    }
    vetoableChangeSupport.fireVetoableChange(propertyName, oldValue, newValue);
  }


  /**
   * Adds a <code>VetoableChangeListener</code> to the listener list.
   * The listener is registered for all properties.
   *
   * @param listener the <code>VetoableChangeListener</code> to be added
   */
  public synchronized void addVetoableChangeListener(VetoableChangeListener listener) {
    if (vetoableChangeSupport == null) {
      vetoableChangeSupport = new java.beans.VetoableChangeSupport(this);
    }
    vetoableChangeSupport.addVetoableChangeListener(listener);
  }


  /**
   * Removes a <code>VetoableChangeListener</code> from the listener list.
   * This removes a <code>VetoableChangeListener</code> that was registered
   * for all properties.
   *
   * @param listener the <code>VetoableChangeListener</code> to be removed
   */
  public synchronized void removeVetoableChangeListener(VetoableChangeListener listener) {
    if (vetoableChangeSupport == null) {
      return;
    }
    vetoableChangeSupport.removeVetoableChangeListener(listener);
  }


  /**
   * Returns an array of all the vetoable change listeners
   * registered on this component.
   *
   * @return all of the component's <code>VetoableChangeListener</code>s or an empty array if no
   * vetoable change listeners are currently registered
   * @see #addVetoableChangeListener
   * @see #removeVetoableChangeListener
   * @since 1.4
   */
  public synchronized VetoableChangeListener[] getVetoableChangeListeners() {
    if (vetoableChangeSupport == null) {
      return new VetoableChangeListener[0];
    }
    return vetoableChangeSupport.getVetoableChangeListeners();
  }


  /**
   * Returns the top-level ancestor of this component (either the
   * containing <code>Window</code> or <code>Applet</code>),
   * or <code>null</code> if this component has not
   * been added to any container.
   *
   * @return the top-level <code>Container</code> that this component is in, or <code>null</code> if
   * not in any container
   */
  public Container getTopLevelAncestor() {
    for (Container p = this; p != null; p = p.getParent()) {
      if (p instanceof Window || p instanceof Applet) {
        return p;
      }
    }
    return null;
  }

  private AncestorNotifier getAncestorNotifier() {
    return (AncestorNotifier)
        getClientProperty(JComponent_ANCESTOR_NOTIFIER);
  }

  /**
   * Registers <code>listener</code> so that it will receive
   * <code>AncestorEvents</code> when it or any of its ancestors
   * move or are made visible or invisible.
   * Events are also sent when the component or its ancestors are added
   * or removed from the containment hierarchy.
   *
   * @param listener the <code>AncestorListener</code> to register
   * @see AncestorEvent
   */
  public void addAncestorListener(AncestorListener listener) {
    AncestorNotifier ancestorNotifier = getAncestorNotifier();
    if (ancestorNotifier == null) {
      ancestorNotifier = new AncestorNotifier(this);
      putClientProperty(JComponent_ANCESTOR_NOTIFIER,
          ancestorNotifier);
    }
    ancestorNotifier.addAncestorListener(listener);
  }

  /**
   * Unregisters <code>listener</code> so that it will no longer receive
   * <code>AncestorEvents</code>.
   *
   * @param listener the <code>AncestorListener</code> to be removed
   * @see #addAncestorListener
   */
  public void removeAncestorListener(AncestorListener listener) {
    AncestorNotifier ancestorNotifier = getAncestorNotifier();
    if (ancestorNotifier == null) {
      return;
    }
    ancestorNotifier.removeAncestorListener(listener);
    if (ancestorNotifier.listenerList.getListenerList().length == 0) {
      ancestorNotifier.removeAllListeners();
      putClientProperty(JComponent_ANCESTOR_NOTIFIER, null);
    }
  }

  /**
   * Returns an array of all the ancestor listeners
   * registered on this component.
   *
   * @return all of the component's <code>AncestorListener</code>s or an empty array if no ancestor
   * listeners are currently registered
   * @see #addAncestorListener
   * @see #removeAncestorListener
   * @since 1.4
   */
  public AncestorListener[] getAncestorListeners() {
    AncestorNotifier ancestorNotifier = getAncestorNotifier();
    if (ancestorNotifier == null) {
      return new AncestorListener[0];
    }
    return ancestorNotifier.getAncestorListeners();
  }

  /**
   * Returns an array of all the objects currently registered
   * as <code><em>Foo</em>Listener</code>s
   * upon this <code>JComponent</code>.
   * <code><em>Foo</em>Listener</code>s are registered using the
   * <code>add<em>Foo</em>Listener</code> method.
   *
   * <p>
   *
   * You can specify the <code>listenerType</code> argument
   * with a class literal,
   * such as
   * <code><em>Foo</em>Listener.class</code>.
   * For example, you can query a
   * <code>JComponent</code> <code>c</code>
   * for its mouse listeners with the following code:
   * <pre>MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));</pre>
   * If no such listeners exist, this method returns an empty array.
   *
   * @param listenerType the type of listeners requested; this parameter should specify an interface
   * that descends from <code>java.util.EventListener</code>
   * @return an array of all objects registered as <code><em>Foo</em>Listener</code>s on this
   * component, or an empty array if no such listeners have been added
   * @throws ClassCastException if <code>listenerType</code> doesn't specify a class or interface
   * that implements <code>java.util.EventListener</code>
   * @see #getVetoableChangeListeners
   * @see #getAncestorListeners
   * @since 1.3
   */
  public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
    T[] result;
    if (listenerType == AncestorListener.class) {
      // AncestorListeners are handled by the AncestorNotifier
      result = (T[]) getAncestorListeners();
    } else if (listenerType == VetoableChangeListener.class) {
      // VetoableChangeListeners are handled by VetoableChangeSupport
      result = (T[]) getVetoableChangeListeners();
    } else if (listenerType == PropertyChangeListener.class) {
      // PropertyChangeListeners are handled by PropertyChangeSupport
      result = (T[]) getPropertyChangeListeners();
    } else {
      result = listenerList.getListeners(listenerType);
    }

    if (result.length == 0) {
      return super.getListeners(listenerType);
    }
    return result;
  }

  /**
   * Notifies this component that it now has a parent component.
   * When this method is invoked, the chain of parent components is
   * set up with <code>KeyboardAction</code> event listeners.
   * This method is called by the toolkit internally and should
   * not be called directly by programs.
   *
   * @see #registerKeyboardAction
   */
  public void addNotify() {
    super.addNotify();
    firePropertyChange("ancestor", null, getParent());

    registerWithKeyboardManager(false);
    registerNextFocusableComponent();
  }


  /**
   * Notifies this component that it no longer has a parent component.
   * When this method is invoked, any <code>KeyboardAction</code>s
   * set up in the the chain of parent components are removed.
   * This method is called by the toolkit internally and should
   * not be called directly by programs.
   *
   * @see #registerKeyboardAction
   */
  public void removeNotify() {
    super.removeNotify();
    // This isn't strictly correct.  The event shouldn't be
    // fired until *after* the parent is set to null.  But
    // we only get notified before that happens
    firePropertyChange("ancestor", getParent(), null);

    unregisterWithKeyboardManager();
    deregisterNextFocusableComponent();

    if (getCreatedDoubleBuffer()) {
      RepaintManager.currentManager(this).resetDoubleBuffer();
      setCreatedDoubleBuffer(false);
    }
    if (autoscrolls) {
      Autoscroller.stop(this);
    }
  }


  /**
   * Adds the specified region to the dirty region list if the component
   * is showing.  The component will be repainted after all of the
   * currently pending events have been dispatched.
   *
   * @param tm this parameter is not used
   * @param x the x value of the dirty region
   * @param y the y value of the dirty region
   * @param width the width of the dirty region
   * @param height the height of the dirty region
   * @see #isPaintingOrigin()
   * @see java.awt.Component#isShowing
   * @see RepaintManager#addDirtyRegion
   */
  public void repaint(long tm, int x, int y, int width, int height) {
    RepaintManager.currentManager(SunToolkit.targetToAppContext(this))
        .addDirtyRegion(this, x, y, width, height);
  }


  /**
   * Adds the specified region to the dirty region list if the component
   * is showing.  The component will be repainted after all of the
   * currently pending events have been dispatched.
   *
   * @param r a <code>Rectangle</code> containing the dirty region
   * @see #isPaintingOrigin()
   * @see java.awt.Component#isShowing
   * @see RepaintManager#addDirtyRegion
   */
  public void repaint(Rectangle r) {
    repaint(0, r.x, r.y, r.width, r.height);
  }


  /**
   * Supports deferred automatic layout.
   * <p>
   * Calls <code>invalidate</code> and then adds this component's
   * <code>validateRoot</code> to a list of components that need to be
   * validated.  Validation will occur after all currently pending
   * events have been dispatched.  In other words after this method
   * is called,  the first validateRoot (if any) found when walking
   * up the containment hierarchy of this component will be validated.
   * By default, <code>JRootPane</code>, <code>JScrollPane</code>,
   * and <code>JTextField</code> return true
   * from <code>isValidateRoot</code>.
   * <p>
   * This method will automatically be called on this component
   * when a property value changes such that size, location, or
   * internal layout of this component has been affected.  This automatic
   * updating differs from the AWT because programs generally no
   * longer need to invoke <code>validate</code> to get the contents of the
   * GUI to update.
   *
   * @see java.awt.Component#invalidate
   * @see java.awt.Container#validate
   * @see #isValidateRoot
   * @see RepaintManager#addInvalidComponent
   */
  public void revalidate() {
    if (getParent() == null) {
      // Note: We don't bother invalidating here as once added
      // to a valid parent invalidate will be invoked (addImpl
      // invokes addNotify which will invoke invalidate on the
      // new Component). Also, if we do add a check to isValid
      // here it can potentially be called before the constructor
      // which was causing some people grief.
      return;
    }
    if (SunToolkit.isDispatchThreadForAppContext(this)) {
      invalidate();
      RepaintManager.currentManager(this).addInvalidComponent(this);
    } else {
      // To avoid a flood of Runnables when constructing GUIs off
      // the EDT, a flag is maintained as to whether or not
      // a Runnable has been scheduled.
      if (revalidateRunnableScheduled.getAndSet(true)) {
        return;
      }
      SunToolkit.executeOnEventHandlerThread(this, () -> {
        revalidateRunnableScheduled.set(false);
        revalidate();
      });
    }
  }

  /**
   * If this method returns true, <code>revalidate</code> calls by
   * descendants of this component will cause the entire tree
   * beginning with this root to be validated.
   * Returns false by default.  <code>JScrollPane</code> overrides
   * this method and returns true.
   *
   * @return always returns false
   * @see #revalidate
   * @see java.awt.Component#invalidate
   * @see java.awt.Container#validate
   * @see java.awt.Container#isValidateRoot
   */
  @Override
  public boolean isValidateRoot() {
    return false;
  }


  /**
   * Returns true if this component tiles its children -- that is, if
   * it can guarantee that the children will not overlap.  The
   * repainting system is substantially more efficient in this
   * common case.  <code>JComponent</code> subclasses that can't make this
   * guarantee, such as <code>JLayeredPane</code>,
   * should override this method to return false.
   *
   * @return always returns true
   */
  public boolean isOptimizedDrawingEnabled() {
    return true;
  }

  /**
   * Returns {@code true} if a paint triggered on a child component should cause
   * painting to originate from this Component, or one of its ancestors.
   * <p>
   * Calling {@link #repaint} or {@link #paintImmediately(int, int, int, int)}
   * on a Swing component will result in calling
   * the {@link JComponent#paintImmediately(int, int, int, int)} method of
   * the first ancestor which {@code isPaintingOrigin()} returns {@code true}, if there are any.
   * <p>
   * {@code JComponent} subclasses that need to be painted when any of their
   * children are repainted should override this method to return {@code true}.
   *
   * @return always returns {@code false}
   * @see #paintImmediately(int, int, int, int)
   */
  protected boolean isPaintingOrigin() {
    return false;
  }

  /**
   * Paints the specified region in this component and all of its
   * descendants that overlap the region, immediately.
   * <p>
   * It's rarely necessary to call this method.  In most cases it's
   * more efficient to call repaint, which defers the actual painting
   * and can collapse redundant requests into a single paint call.
   * This method is useful if one needs to update the display while
   * the current event is being dispatched.
   * <p>
   * This method is to be overridden when the dirty region needs to be changed
   * for components that are painting origins.
   *
   * @param x the x value of the region to be painted
   * @param y the y value of the region to be painted
   * @param w the width of the region to be painted
   * @param h the height of the region to be painted
   * @see #repaint
   * @see #isPaintingOrigin()
   */
  public void paintImmediately(int x, int y, int w, int h) {
    Component c = this;
    Component parent;

    if (!isShowing()) {
      return;
    }

    JComponent paintingOigin = SwingUtilities.getPaintingOrigin(this);
    if (paintingOigin != null) {
      Rectangle rectangle = SwingUtilities.convertRectangle(
          c, new Rectangle(x, y, w, h), paintingOigin);
      paintingOigin.paintImmediately(rectangle.x, rectangle.y, rectangle.width, rectangle.height);
      return;
    }

    while (!c.isOpaque()) {
      parent = c.getParent();
      if (parent != null) {
        x += c.getX();
        y += c.getY();
        c = parent;
      } else {
        break;
      }

      if (!(c instanceof JComponent)) {
        break;
      }
    }
    if (c instanceof JComponent) {
      ((JComponent) c)._paintImmediately(x, y, w, h);
    } else {
      c.repaint(x, y, w, h);
    }
  }

  /**
   * Paints the specified region now.
   *
   * @param r a <code>Rectangle</code> containing the region to be painted
   */
  public void paintImmediately(Rectangle r) {
    paintImmediately(r.x, r.y, r.width, r.height);
  }

  /**
   * Returns whether this component should be guaranteed to be on top.
   * For example, it would make no sense for <code>Menu</code>s to pop up
   * under another component, so they would always return true.
   * Most components will want to return false, hence that is the default.
   *
   * @return always returns false
   */
  // package private
  boolean alwaysOnTop() {
    return false;
  }

  void setPaintingChild(Component paintingChild) {
    this.paintingChild = paintingChild;
  }

  void _paintImmediately(int x, int y, int w, int h) {
    Graphics g;
    Container c;
    Rectangle b;

    int tmpX, tmpY, tmpWidth, tmpHeight;
    int offsetX = 0, offsetY = 0;

    boolean hasBuffer = false;

    JComponent bufferedComponent = null;
    JComponent paintingComponent = this;

    RepaintManager repaintManager = RepaintManager.currentManager(this);
    // parent Container's up to Window or Applet. First container is
    // the direct parent. Note that in testing it was faster to
    // alloc a new Vector vs keeping a stack of them around, and gc
    // seemed to have a minimal effect on this.
    java.util.List<Component> path = new java.util.ArrayList<Component>(7);
    int pIndex = -1;
    int pCount = 0;

    tmpX = tmpY = tmpWidth = tmpHeight = 0;

    Rectangle paintImmediatelyClip = fetchRectangle();
    paintImmediatelyClip.x = x;
    paintImmediatelyClip.y = y;
    paintImmediatelyClip.width = w;
    paintImmediatelyClip.height = h;

    // System.out.println("1) ************* in _paintImmediately for " + this);

    boolean ontop = alwaysOnTop() && isOpaque();
    if (ontop) {
      SwingUtilities.computeIntersection(0, 0, getWidth(), getHeight(),
          paintImmediatelyClip);
      if (paintImmediatelyClip.width == 0) {
        recycleRectangle(paintImmediatelyClip);
        return;
      }
    }
    Component child;
    for (c = this, child = null;
        c != null && !(c instanceof Window) && !(c instanceof Applet);
        child = c, c = c.getParent()) {
      JComponent jc = (c instanceof JComponent) ? (JComponent) c :
          null;
      path.add(c);
      if (!ontop && jc != null && !jc.isOptimizedDrawingEnabled()) {
        boolean resetPC;

        // Children of c may overlap, three possible cases for the
        // painting region:
        // . Completely obscured by an opaque sibling, in which
        //   case there is no need to paint.
        // . Partially obscured by a sibling: need to start
        //   painting from c.
        // . Otherwise we aren't obscured and thus don't need to
        //   start painting from parent.
        if (c != this) {
          if (jc.isPaintingOrigin()) {
            resetPC = true;
          } else {
            Component[] children = c.getComponents();
            int i = 0;
            for (; i < children.length; i++) {
              if (children[i] == child) {
                break;
              }
            }
            switch (jc.getObscuredState(i,
                paintImmediatelyClip.x,
                paintImmediatelyClip.y,
                paintImmediatelyClip.width,
                paintImmediatelyClip.height)) {
              case NOT_OBSCURED:
                resetPC = false;
                break;
              case COMPLETELY_OBSCURED:
                recycleRectangle(paintImmediatelyClip);
                return;
              default:
                resetPC = true;
                break;
            }
          }
        } else {
          resetPC = false;
        }

        if (resetPC) {
          // Get rid of any buffer since we draw from here and
          // we might draw something larger
          paintingComponent = jc;
          pIndex = pCount;
          offsetX = offsetY = 0;
          hasBuffer = false;
        }
      }
      pCount++;

      // look to see if the parent (and therefor this component)
      // is double buffered
      if (repaintManager.isDoubleBufferingEnabled() && jc != null &&
          jc.isDoubleBuffered()) {
        hasBuffer = true;
        bufferedComponent = jc;
      }

      // if we aren't on top, include the parent's clip
      if (!ontop) {
        int bx = c.getX();
        int by = c.getY();
        tmpWidth = c.getWidth();
        tmpHeight = c.getHeight();
        SwingUtilities.computeIntersection(tmpX, tmpY, tmpWidth, tmpHeight, paintImmediatelyClip);
        paintImmediatelyClip.x += bx;
        paintImmediatelyClip.y += by;
        offsetX += bx;
        offsetY += by;
      }
    }

    // If the clip width or height is negative, don't bother painting
    if (c == null || c.getPeer() == null ||
        paintImmediatelyClip.width <= 0 ||
        paintImmediatelyClip.height <= 0) {
      recycleRectangle(paintImmediatelyClip);
      return;
    }

    paintingComponent.setFlag(IS_REPAINTING, true);

    paintImmediatelyClip.x -= offsetX;
    paintImmediatelyClip.y -= offsetY;

    // Notify the Components that are going to be painted of the
    // child component to paint to.
    if (paintingComponent != this) {
      Component comp;
      int i = pIndex;
      for (; i > 0; i--) {
        comp = path.get(i);
        if (comp instanceof JComponent) {
          ((JComponent) comp).setPaintingChild(path.get(i - 1));
        }
      }
    }
    try {
      if ((g = safelyGetGraphics(paintingComponent, c)) != null) {
        try {
          if (hasBuffer) {
            RepaintManager rm = RepaintManager.currentManager(
                bufferedComponent);
            rm.beginPaint();
            try {
              rm.paint(paintingComponent, bufferedComponent, g,
                  paintImmediatelyClip.x,
                  paintImmediatelyClip.y,
                  paintImmediatelyClip.width,
                  paintImmediatelyClip.height);
            } finally {
              rm.endPaint();
            }
          } else {
            g.setClip(paintImmediatelyClip.x, paintImmediatelyClip.y,
                paintImmediatelyClip.width, paintImmediatelyClip.height);
            paintingComponent.paint(g);
          }
        } finally {
          g.dispose();
        }
      }
    } finally {
      // Reset the painting child for the parent components.
      if (paintingComponent != this) {
        Component comp;
        int i = pIndex;
        for (; i > 0; i--) {
          comp = path.get(i);
          if (comp instanceof JComponent) {
            ((JComponent) comp).setPaintingChild(null);
          }
        }
      }
      paintingComponent.setFlag(IS_REPAINTING, false);
    }
    recycleRectangle(paintImmediatelyClip);
  }

  /**
   * Paints to the specified graphics.  This does not set the clip and it
   * does not adjust the Graphics in anyway, callers must do that first.
   * This method is package-private for RepaintManager.PaintManager and
   * its subclasses to call, it is NOT intended for general use outside
   * of that.
   */
  void paintToOffscreen(Graphics g, int x, int y, int w, int h, int maxX,
      int maxY) {
    try {
      setFlag(ANCESTOR_USING_BUFFER, true);
      if ((y + h) < maxY || (x + w) < maxX) {
        setFlag(IS_PAINTING_TILE, true);
      }
      if (getFlag(IS_REPAINTING)) {
        // Called from paintImmediately (RepaintManager) to fill
        // repaint request
        paint(g);
      } else {
        // Called from paint() (AWT) to repair damage
        if (!rectangleIsObscured(x, y, w, h)) {
          paintComponent(g);
          paintBorder(g);
        }
        paintChildren(g);
      }
    } finally {
      setFlag(ANCESTOR_USING_BUFFER, false);
      setFlag(IS_PAINTING_TILE, false);
    }
  }

  /**
   * Returns whether or not the region of the specified component is
   * obscured by a sibling.
   *
   * @return NOT_OBSCURED if non of the siblings above the Component obscure it, COMPLETELY_OBSCURED
   * if one of the siblings completely obscures the Component or PARTIALLY_OBSCURED if the Component
   * is only partially obscured.
   */
  private int getObscuredState(int compIndex, int x, int y, int width,
      int height) {
    int retValue = NOT_OBSCURED;
    Rectangle tmpRect = fetchRectangle();

    for (int i = compIndex - 1; i >= 0; i--) {
      Component sibling = getComponent(i);
      if (!sibling.isVisible()) {
        continue;
      }
      Rectangle siblingRect;
      boolean opaque;
      if (sibling instanceof JComponent) {
        opaque = sibling.isOpaque();
        if (!opaque) {
          if (retValue == PARTIALLY_OBSCURED) {
            continue;
          }
        }
      } else {
        opaque = true;
      }
      siblingRect = sibling.getBounds(tmpRect);
      if (opaque && x >= siblingRect.x && (x + width) <=
          (siblingRect.x + siblingRect.width) &&
          y >= siblingRect.y && (y + height) <=
          (siblingRect.y + siblingRect.height)) {
        recycleRectangle(tmpRect);
        return COMPLETELY_OBSCURED;
      } else if (retValue == NOT_OBSCURED &&
          !((x + width <= siblingRect.x) ||
              (y + height <= siblingRect.y) ||
              (x >= siblingRect.x + siblingRect.width) ||
              (y >= siblingRect.y + siblingRect.height))) {
        retValue = PARTIALLY_OBSCURED;
      }
    }
    recycleRectangle(tmpRect);
    return retValue;
  }

  /**
   * Returns true, which implies that before checking if a child should
   * be painted it is first check that the child is not obscured by another
   * sibling. This is only checked if <code>isOptimizedDrawingEnabled</code>
   * returns false.
   *
   * @return always returns true
   */
  boolean checkIfChildObscuredBySibling() {
    return true;
  }


  private void setFlag(int aFlag, boolean aValue) {
    if (aValue) {
      flags |= (1 << aFlag);
    } else {
      flags &= ~(1 << aFlag);
    }
  }

  private boolean getFlag(int aFlag) {
    int mask = (1 << aFlag);
    return ((flags & mask) == mask);
  }

  // These functions must be static so that they can be called from
  // subclasses inside the package, but whose inheritance hierarhcy includes
  // classes outside of the package below JComponent (e.g., JTextArea).
  static void setWriteObjCounter(JComponent comp, byte count) {
    comp.flags = (comp.flags & ~(0xFF << WRITE_OBJ_COUNTER_FIRST)) |
        (count << WRITE_OBJ_COUNTER_FIRST);
  }

  static byte getWriteObjCounter(JComponent comp) {
    return (byte) ((comp.flags >> WRITE_OBJ_COUNTER_FIRST) & 0xFF);
  }

  /** Buffering **/

  /**
   * Sets whether this component should use a buffer to paint.
   * If set to true, all the drawing from this component will be done
   * in an offscreen painting buffer. The offscreen painting buffer will
   * the be copied onto the screen.
   * If a <code>Component</code> is buffered and one of its ancestor
   * is also buffered, the ancestor buffer will be used.
   *
   * @param aFlag if true, set this component to be double buffered
   */
  public void setDoubleBuffered(boolean aFlag) {
    setFlag(IS_DOUBLE_BUFFERED, aFlag);
  }

  /**
   * Returns whether this component should use a buffer to paint.
   *
   * @return true if this component is double buffered, otherwise false
   */
  public boolean isDoubleBuffered() {
    return getFlag(IS_DOUBLE_BUFFERED);
  }

  /**
   * Returns the <code>JRootPane</code> ancestor for this component.
   *
   * @return the <code>JRootPane</code> that contains this component, or <code>null</code> if no
   * <code>JRootPane</code> is found
   */
  public JRootPane getRootPane() {
    return SwingUtilities.getRootPane(this);
  }

  /** Serialization **/

  /**
   * This is called from Component by way of reflection. Do NOT change
   * the name unless you change the code in Component as well.
   */
  void compWriteObjectNotify() {
    byte count = JComponent.getWriteObjCounter(this);
    JComponent.setWriteObjCounter(this, (byte) (count + 1));
    if (count != 0) {
      return;
    }

    uninstallUIAndProperties();

        /* JTableHeader is in a separate package, which prevents it from
         * being able to override this package-private method the way the
         * other components can.  We don't want to make this method protected
         * because it would introduce public-api for a less-than-desirable
         * serialization scheme, so we compromise with this 'instanceof' hack
         * for now.
         */
    if (getToolTipText() != null ||
        this instanceof javax.swing.table.JTableHeader) {
      ToolTipManager.sharedInstance().unregisterComponent(JComponent.this);
    }
  }

  /**
   * This object is the <code>ObjectInputStream</code> callback
   * that's called after a complete graph of objects (including at least
   * one <code>JComponent</code>) has been read.
   * It sets the UI property of each Swing component
   * that was read to the current default with <code>updateUI</code>.
   * <p>
   * As each  component is read in we keep track of the current set of
   * root components here, in the roots vector.  Note that there's only one
   * <code>ReadObjectCallback</code> per <code>ObjectInputStream</code>,
   * they're stored in the static <code>readObjectCallbacks</code>
   * hashtable.
   *
   * @see java.io.ObjectInputStream#registerValidation
   * @see SwingUtilities#updateComponentTreeUI
   */
  private class ReadObjectCallback implements ObjectInputValidation {

    private final Vector<JComponent> roots = new Vector<JComponent>(1);
    private final ObjectInputStream inputStream;

    ReadObjectCallback(ObjectInputStream s) throws Exception {
      inputStream = s;
      s.registerValidation(this, 0);
    }

    /**
     * This is the method that's called after the entire graph
     * of objects has been read in.  It initializes
     * the UI property of all of the copmonents with
     * <code>SwingUtilities.updateComponentTreeUI</code>.
     */
    public void validateObject() throws InvalidObjectException {
      try {
        for (JComponent root : roots) {
          SwingUtilities.updateComponentTreeUI(root);
        }
      } finally {
        readObjectCallbacks.remove(inputStream);
      }
    }

    /**
     * If <code>c</code> isn't a descendant of a component we've already
     * seen, then add it to the roots <code>Vector</code>.
     *
     * @param c the <code>JComponent</code> to add
     */
    private void registerComponent(JComponent c) {
            /* If the Component c is a descendant of one of the
             * existing roots (or it IS an existing root), we're done.
             */
      for (JComponent root : roots) {
        for (Component p = c; p != null; p = p.getParent()) {
          if (p == root) {
            return;
          }
        }
      }

            /* Otherwise: if Component c is an ancestor of any of the
             * existing roots then remove them and add c (the "new root")
             * to the roots vector.
             */
      for (int i = 0; i < roots.size(); i++) {
        JComponent root = roots.elementAt(i);
        for (Component p = root.getParent(); p != null; p = p.getParent()) {
          if (p == c) {
            roots.removeElementAt(i--); // !!
            break;
          }
        }
      }

      roots.addElement(c);
    }
  }


  /**
   * We use the <code>ObjectInputStream</code> "registerValidation"
   * callback to update the UI for the entire tree of components
   * after they've all been read in.
   *
   * @param s the <code>ObjectInputStream</code> from which to read
   */
  private void readObject(ObjectInputStream s)
      throws IOException, ClassNotFoundException {
    s.defaultReadObject();

        /* If there's no ReadObjectCallback for this stream yet, that is, if
         * this is the first call to JComponent.readObject() for this
         * graph of objects, then create a callback and stash it
         * in the readObjectCallbacks table.  Note that the ReadObjectCallback
         * constructor takes care of calling s.registerValidation().
         */
    ReadObjectCallback cb = readObjectCallbacks.get(s);
    if (cb == null) {
      try {
        readObjectCallbacks.put(s, cb = new ReadObjectCallback(s));
      } catch (Exception e) {
        throw new IOException(e.toString());
      }
    }
    cb.registerComponent(this);

    // Read back the client properties.
    int cpCount = s.readInt();
    if (cpCount > 0) {
      clientProperties = new ArrayTable();
      for (int counter = 0; counter < cpCount; counter++) {
        clientProperties.put(s.readObject(),
            s.readObject());
      }
    }
    if (getToolTipText() != null) {
      ToolTipManager.sharedInstance().registerComponent(this);
    }
    setWriteObjCounter(this, (byte) 0);
    revalidateRunnableScheduled = new AtomicBoolean(false);
  }


  /**
   * Before writing a <code>JComponent</code> to an
   * <code>ObjectOutputStream</code> we temporarily uninstall its UI.
   * This is tricky to do because we want to uninstall
   * the UI before any of the <code>JComponent</code>'s children
   * (or its <code>LayoutManager</code> etc.) are written,
   * and we don't want to restore the UI until the most derived
   * <code>JComponent</code> subclass has been been stored.
   *
   * @param s the <code>ObjectOutputStream</code> in which to write
   */
  private void writeObject(ObjectOutputStream s) throws IOException {
    s.defaultWriteObject();
    if (getUIClassID().equals(uiClassID)) {
      byte count = JComponent.getWriteObjCounter(this);
      JComponent.setWriteObjCounter(this, --count);
      if (count == 0 && ui != null) {
        ui.installUI(this);
      }
    }
    ArrayTable.writeArrayTable(s, clientProperties);
  }


  /**
   * Returns a string representation of this <code>JComponent</code>.
   * This method
   * is intended to be used only for debugging purposes, and the
   * content and format of the returned string may vary between
   * implementations. The returned string may be empty but may not
   * be <code>null</code>.
   *
   * @return a string representation of this <code>JComponent</code>
   */
  protected String paramString() {
    String preferredSizeString = (isPreferredSizeSet() ?
        getPreferredSize().toString() : "");
    String minimumSizeString = (isMinimumSizeSet() ?
        getMinimumSize().toString() : "");
    String maximumSizeString = (isMaximumSizeSet() ?
        getMaximumSize().toString() : "");
    String borderString = (border == null ? ""
        : (border == this ? "this" : border.toString()));

    return super.paramString() +
        ",alignmentX=" + alignmentX +
        ",alignmentY=" + alignmentY +
        ",border=" + borderString +
        ",flags=" + flags +             // should beef this up a bit
        ",maximumSize=" + maximumSizeString +
        ",minimumSize=" + minimumSizeString +
        ",preferredSize=" + preferredSizeString;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  @Deprecated
  public void hide() {
    boolean showing = isShowing();
    super.hide();
    if (showing) {
      Container parent = getParent();
      if (parent != null) {
        Rectangle r = getBounds();
        parent.repaint(r.x, r.y, r.width, r.height);
      }
      revalidate();
    }
  }

}
